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xorg.conf(5)		      File Formats Manual		  xorg.conf(5)

NAME
       xorg.conf - configuration File for Xorg X server

INTRODUCTION
       Xorg  supports several mechanisms for supplying/obtaining configuration
       and run-time parameters:	command	line options,  environment  variables,
       the  xorg.conf  configuration  file,  auto-detection,  and fallback de-
       faults.	When the same information is supplied in more  than  one  way,
       the  highest  precedence	 mechanism is used.  The list of mechanisms is
       ordered from highest precedence to lowest.  Note	that not  all  parame-
       ters  can  be supplied via all methods.	The available command line op-
       tions and environment variables (and some defaults)  are	 described  in
       the  Xserver(1)	and Xorg(1) manual pages.  Most	configuration file pa-
       rameters, with their defaults, are described below.  Driver and	module
       specific	 configuration parameters are described	in the relevant	driver
       or module manual	page.

DESCRIPTION
       Xorg uses a configuration file called xorg.conf for its initial	setup.
       This  configuration  file  is searched for in the following places when
       the server is started as	a normal user:

	   /etc/X11/<cmdline>
	   /usr/local/etc/X11/<cmdline>
	   /etc/X11/$XORGCONFIG
	   /usr/local/etc/X11/$XORGCONFIG
	   /etc/X11/xorg.conf-4
	   /etc/X11/xorg.conf
	   /etc/xorg.conf
	   /usr/local/etc/X11/xorg.conf.<hostname>
	   /usr/local/etc/X11/xorg.conf-4
	   /usr/local/etc/X11/xorg.conf
	   /usr/local/lib/X11/xorg.conf.<hostname>
	   /usr/local/lib/X11/xorg.conf-4
	   /usr/local/lib/X11/xorg.conf

       where _cmdline_ is a relative path (with	no ".."	components)  specified
       with  the -config command line option, $XORGCONFIG is the relative path
       (with no	".." components) specified by that environment	variable,  and
       _hostname_ is the machine's hostname as reported	by gethostname(3).

       When  the  Xorg	server	is started by the "root" user, the config file
       search locations	are as follows:

	   <cmdline>
	   /etc/X11/<cmdline>
	   /usr/local/etc/X11/<cmdline>
	   $XORGCONFIG
	   /etc/X11/$XORGCONFIG
	   /usr/local/etc/X11/$XORGCONFIG
	   /etc/X11/xorg.conf-4
	   /etc/X11/xorg.conf
	   /etc/xorg.conf
	   /usr/local/etc/X11/xorg.conf.<hostname>
	   /usr/local/etc/X11/xorg.conf-4
	   /usr/local/etc/X11/xorg.conf
	   /usr/local/lib/X11/xorg.conf.<hostname>
	   /usr/local/lib/X11/xorg.conf-4
	   /usr/local/lib/X11/xorg.conf

       where _cmdline_ is the path specified with the -config command line op-
       tion (which may be absolute or relative), $XORGCONFIG is	the path spec-
       ified by	that environment variable (absolute or relative), $HOME	is the
       path  specified	by  that environment variable (usually the home	direc-
       tory), and _hostname_ is	the machine's hostname as reported by gethost-
       name(3).

       The  xorg.conf  file  is	 composed of a number of sections which	may be
       present in any order, or	omitted	to use default	configuration  values.
       Each section has	the form:

	   Section  "SectionName"
	       SectionEntry
	       ...
	   EndSection

       The section names are:

	   Files	  File pathnames
	   ServerFlags	  Server flags
	   Module	  Dynamic module loading
	   Extensions	  Extension enabling
	   InputDevice	  Input	device description
	   Device	  Graphics device description
	   VideoAdaptor	  Xv video adaptor description
	   Monitor	  Monitor description
	   Modes	  Video	modes descriptions
	   Screen	  Screen configuration
	   ServerLayout	  Overall layout
	   DRI		  DRI-specific configuration
	   Vendor	  Vendor-specific configuration

       The  following obsolete section names are still recognised for compati-
       bility purposes.	 In new	config files, the InputDevice  section	should
       be used instead.

	   Keyboard	  Keyboard configuration
	   Pointer	  Pointer/mouse	configuration

       The old XInput section is no longer recognised.

       The ServerLayout	sections are at	the highest level.  They bind together
       the input and output devices that will be used in a session.  The input
       devices are described in	the InputDevice	sections.  Output devices usu-
       ally consist of multiple	independent components (e.g., a	graphics board
       and  a  monitor).   These multiple components are bound together	in the
       Screen sections,	and it is these	that are referenced by the  ServerLay-
       out section.  Each Screen section binds together	a graphics board and a
       monitor.	 The graphics boards are described in the Device sections, and
       the monitors are	described in the Monitor sections.

       Config  file  keywords are case-insensitive, and	"_" characters are ig-
       nored.  Most strings (including Option names)  are  also	 case-insensi-
       tive, and insensitive to	white space and	"_" characters.

       Each  config  file  entry  usually  takes up a single line in the file.
       They consist of a keyword, which	is possibly followed by	 one  or  more
       arguments,  with	the number and types of	the arguments depending	on the
       keyword.	 The argument types are:

	   Integer     an integer number in decimal, hex or octal
	   Real	       a floating point	number
	   String      a string	enclosed in double quote marks (")

       Note: hex integer values	must be	prefixed with "0x", and	 octal	values
       with "0".

       A  special  keyword called Option may be	used to	provide	free-form data
       to various components of	the server.  The Option	keyword	 takes	either
       one or two string arguments.  The first is the option name, and the op-
       tional second argument is the option value.  Some commonly used	option
       value types include:

	   Integer     an integer number in decimal, hex or octal
	   Real	       a floating point	number
	   String      a sequence of characters
	   Boolean     a boolean value (see below)
	   Frequency   a frequency value (see below)

       Note  that  all	Option	values,	 not just strings, must	be enclosed in
       quotes.

       Boolean options may optionally have a value specified.  When  no	 value
       is specified, the option's value	is TRUE.  The following	boolean	option
       values are recognised as	TRUE:

	   1, on, true,	yes

       and the following boolean option	values are recognised as FALSE:

	   0, off, false, no

       If an option name is prefixed with  "No",  then	the  option  value  is
       negated.

       Example:	the following option entries are equivalent:

	   Option "Accel"   "Off"
	   Option "NoAccel"
	   Option "NoAccel" "On"
	   Option "Accel"   "false"
	   Option "Accel"   "no"

       Frequency  option  values  consist  of a	real number that is optionally
       followed	by one of the following	frequency units:

	   Hz, k, kHz, M, MHz

       When the	unit name is omitted, the correct  units  will	be  determined
       from  the  value	 and  the expectations of the appropriate range	of the
       value.  It is recommended that the units	always be specified when using
       frequency option	values to avoid	any errors in determining the value.

FILES SECTION
       The  Files  section  is used to specify some path names required	by the
       server.	Some of	these paths can	also be	set from the command line (see
       Xserver(1) and Xorg(1)).	 The command line settings override the	values
       specified in the	config file.  The Files	section	is  optional,  as  are
       all of the entries that may appear in it.

       The entries that	can appear in this section are:

       FontPath	"path"
	      sets  the	search path for	fonts.	This path is a comma separated
	      list of font path	elements which the Xorg	 server	 searches  for
	      font databases.  Multiple	FontPath entries may be	specified, and
	      they will	be concatenated	to build up the	fontpath used  by  the
	      server.	Font  path  elements  can be absolute directory	paths,
	      catalogue	directories or a font server identifier.  The  formats
	      of the later two are explained below:

	      Catalogue	directories:

		  Catalogue directories	can be specified using the prefix cat-
		  alogue: before the directory name. The directory can then be
		  populated  with  symlinks pointing to	the real font directo-
		  ries,	using the following syntax in the symlink name:

		      _identifier_:[attribute]:pri=_priority_

		  where	_identifier_ is	an  alphanumeric  identifier,  [attri-
		  bute]	is an attribute	which will be passed to	the underlying
		  FPE and _priority_ is	a number used to  order	 the  fontfile
		  FPEs.	Examples:

		      75dpi:unscaled:pri=20 -_ /usr/share/X11/fonts/75dpi
		      gscript:pri=60 -_	/usr/share/fonts/default/ghostscript
		      misc:unscaled:pri=10 -_ /usr/share/X11/fonts/misc

	      Font server identifiers:

		  Font server identifiers have the form:

		      _trans_/_hostname_:_port-number_

		  where	_trans_	is the transport type to use to	connect	to the
		  font server (e.g., unix for UNIX-domain sockets or tcp for a
		  TCP/IP  connection),	_hostname_  is the hostname of the ma-
		  chine	running	the font server, and _port-number_ is the port
		  number that the font server is listening on (usually 7100).

	      When  this entry is not specified	in the config file, the	server
	      falls back to the	compiled-in default font path, which  contains
	      the following font path elements (which can be set inside	a cat-
	      alogue directory):

		  /usr/local/lib/X11/fonts/misc/
		  /usr/local/lib/X11/fonts/TTF/
		  /usr/local/lib/X11/fonts/OTF/
		  /usr/local/lib/X11/fonts/Type1/
		  /usr/local/lib/X11/fonts/100dpi/
		  /usr/local/lib/X11/fonts/75dpi/

	      Font path	elements that are found	to be invalid are removed from
	      the font path when the server starts up.

       ModulePath "path"
	      sets  the	 search	 path  for loadable Xorg server	modules.  This
	      path is a	comma separated	list of	 directories  which  the  Xorg
	      server searches for loadable modules loading in the order	speci-
	      fied.  Multiple ModulePath entries may be	 specified,  and  they
	      will be concatenated to build the	module search path used	by the
	      server.  The default module path is

		  /usr/local/lib/xorg/modules

       XkbDir "path"
	      sets the base directory for keyboard layout files.  The  -xkbdir
	      command  line  option can	be used	to override this.  The default
	      directory	is

		  /usr/local/share/X11/xkb

SERVERFLAGS SECTION
       In addition to options specific to this section (described below),  the
       ServerFlags section is used to specify some global Xorg server options.
       All of the entries in this section are Options, although	 for  compati-
       bility  purposes	 some  of  the old style entries are still recognised.
       Those old style entries are not documented here,	and using them is dis-
       couraged.  The ServerFlags section is optional, as are the entries that
       may be specified	in it.

       Options specified in this section (with the exception of	the  "Default-
       ServerLayout" Option) may be overridden by Options specified in the ac-
       tive ServerLayout section.  Options with	command	line  equivalents  are
       overridden  when	 their	command	 line equivalent is used.  The options
       recognised by this section are:

       Option "DefaultServerLayout"  "layout-id"
	      This specifies the default ServerLayout section to  use  in  the
	      absence of the -layout command line option.

       Option "NoTrapSignals"  "boolean"
	      This  prevents  the  Xorg	 server	from trapping a	range of unex-
	      pected fatal signals and exiting	cleanly.   Instead,  the  Xorg
	      server will die and drop core where the fault occurred.  The de-
	      fault behaviour is for the Xorg  server  to  exit	 cleanly,  but
	      still  drop  a core file.	 In general you	never want to use this
	      option unless you	are debugging an Xorg server problem and  know
	      how to deal with the consequences.

       Option "UseSIGIO"  "boolean"
	      This  controls whether the Xorg server requests that events from
	      input devices be reported	via a SIGIO signal handler (also known
	      as SIGPOLL on some platforms), or	only reported via the standard
	      select(3)	loop.  The default  behaviour  is  platform  specific.
	      In general you do	not want to use	this option unless you are de-
	      bugging the Xorg server, or working around a specific bug	 until
	      it is fixed, and understand the consequences.

       Option "DontVTSwitch"  "boolean"
	      This  disallows  the  use	 of the	Ctrl+Alt+Fn sequence (where Fn
	      refers to	one of the numbered function keys).  That sequence  is
	      normally used to switch to another "virtual terminal" on operat-
	      ing systems that have this feature.  When	 this  option  is  en-
	      abled, that key sequence has no special meaning and is passed to
	      clients.	Default: off.

       Option "DontZap"	 "boolean"
	      This disallows the use of	the Terminate_Server XKB action	 (usu-
	      ally on Ctrl+Alt+Backspace, depending on XKB options).  This ac-
	      tion is normally used to terminate the Xorg server.   When  this
	      option is	enabled, the action has	no effect.  Default: off.

       Option "DontZoom"  "boolean"
	      This   disallows	 the   use  of	the  Ctrl+Alt+Keypad-Plus  and
	      Ctrl+Alt+Keypad-Minus sequences.	These sequences	allows you  to
	      switch  between video modes.  When this option is	enabled, those
	      key sequences have no special meaning and	are passed to clients.
	      Default: off.

       Option "DisableVidModeExtension"	 "boolean"
	      This  disables  the  parts  of the VidMode extension used	by the
	      xvidtune client that can be used to change the video modes.  De-
	      fault: the VidMode extension is enabled.

       Option "AllowNonLocalXvidtune"  "boolean"
	      This  allows the xvidtune	client (and other clients that use the
	      VidMode extension) to connect from another host.	Default: off.

       Option "AllowMouseOpenFail"  "boolean"
	      This tells the mousedrv(4) and vmmouse(4)	drivers	to not	report
	      failure if the mouse device can't	be opened/initialised.	It has
	      no effect	on the evdev(4)	or other drivers.  The previous	 func-
	      tionality	 of  allowing the server to start up even if the mouse
	      device can't be opened/initialised is now	 handled  by  the  Al-
	      lowEmptyInput option.  Default: false.

       Option "VTSysReq"  "boolean"
	      enables  the  SYSV-style VT switch sequence for non-SYSV systems
	      which support VT switching.  This	sequence is Alt-SysRq followed
	      by  a function key (Fn).	This prevents the Xorg server trapping
	      the keys used for	the default VT switch  sequence,  which	 means
	      that clients can access them.  Default: off.

       Option "BlankTime"  "time"
	      sets  the	 inactivity timeout for	the blank phase	of the screen-
	      saver.  time is in minutes.  This	 is  equivalent	 to  the  Xorg
	      server's	-s flag, and the value can be changed at run-time with
	      xset(1).	Default: 10 minutes.

       Option "StandbyTime"  "time"
	      sets the inactivity timeout for the standby phase	of DPMS	 mode.
	      time  is	in  minutes,  and the value can	be changed at run-time
	      with xset(1).  Default: 10 minutes.  This	is only	 suitable  for
	      VESA  DPMS  compatible monitors, and may not be supported	by all
	      video drivers.  It is only enabled for  screens  that  have  the
	      "DPMS" option set	(see the MONITOR section below).

       Option "SuspendTime"  "time"
	      sets  the	inactivity timeout for the suspend phase of DPMS mode.
	      time is in minutes, and the value	can  be	 changed  at  run-time
	      with  xset(1).   Default:	10 minutes.  This is only suitable for
	      VESA DPMS	compatible monitors, and may not be supported  by  all
	      video  drivers.	It  is	only enabled for screens that have the
	      "DPMS" option set	(see the MONITOR section below).

       Option "OffTime"	 "time"
	      sets the inactivity timeout for the  off	phase  of  DPMS	 mode.
	      time  is	in  minutes,  and the value can	be changed at run-time
	      with xset(1).  Default: 10 minutes.  This	is only	 suitable  for
	      VESA  DPMS  compatible monitors, and may not be supported	by all
	      video drivers.  It is only enabled for  screens  that  have  the
	      "DPMS" option set	(see the MONITOR section below).

       Option "Pixmap"	"bpp"
	      This sets	the pixmap format to use for depth 24.	Allowed	values
	      for bpp are 24 and 32.  Default: 32  unless  driver  constraints
	      don't  allow this	(which is rare).  Note:	some clients don't be-
	      have well	when this value	is set to 24.

       Option "PC98"  "boolean"
	      Specify that the machine is  a  Japanese	PC-98  machine.	  This
	      should  not be enabled for anything other	than the Japanese-spe-
	      cific PC-98 architecture.	 Default: auto-detected.

       Option "NoPM"  "boolean"
	      Disables something to do with power management events.  Default:
	      PM enabled on platforms that support it.

       Option "Xinerama"  "boolean"
	      enable or	disable	XINERAMA extension.  Default is	disabled.

       Option "AIGLX" "boolean"
	      enable or	disable	AIGLX. AIGLX is	enabled	by default.

       Option "DRI2" "boolean"
	      enable or	disable	DRI2. DRI2 is disabled by default.

       Option "GlxVisuals" "string"
	      This  option  controls how many GLX visuals the GLX modules sets
	      up.  The default value is	typical, which will setup up a typical
	      subset  of  the GLXFBConfigs provided by the driver as GLX visu-
	      als.  Other options are minimal, which will set up  the  minimal
	      set  allowed  by	the GLX	specification and all which will setup
	      GLX visuals for all GLXFBConfigs.

       Option "UseDefaultFontPath" "boolean"
	      Include the default font path even if other paths	are  specified
	      in xorg.conf. If enabled,	other font paths are included as well.
	      Enabled by default.

       Option "IgnoreABI" "boolean"
	      Allow modules built for a	 different,  potentially  incompatible
	      version of the X server to load. Disabled	by default.

       Option "AllowEmptyInput"	"boolean"
	      If  enabled,  don't add the standard keyboard and	mouse drivers,
	      if there are no input devices in the config  file.   Enabled  by
	      default if AutoAddDevices	and AutoEnableDevices is enabled, oth-
	      erwise disabled.	If AllowEmptyInput is on,  devices  using  the
	      kbd, mouse or vmmouse driver are ignored.

       Option "AutoAddDevices" "boolean"
	      If  this	option is disabled, then no devices will be added from
	      HAL events.  Enabled by default.

       Option "AutoEnableDevices" "boolean"
	      If this option is	disabled, then the devices will	be added  (and
	      the  DevicePresenceNotify	 event	sent),	but  not enabled, thus
	      leaving policy up	to the client.	Enabled	by default.

       Option "Log" "string"
	      This option controls whether the log is flushed and/or synced to
	      disk  after  each	 message.   Possible values are	flush or sync.
	      Unset by default.

MODULE SECTION
       The Module section is used to specify which Xorg	server modules	should
       be  loaded.   This  section is ignored when the Xorg server is built in
       static form.  The type of modules normally loaded in this  section  are
       Xorg  server extension modules.	Most other module types	are loaded au-
       tomatically when	they are needed	via other mechanisms.  The Module sec-
       tion  is	 optional,  as are all of the entries that may be specified in
       it.

       Entries in this section may be in two forms.  The first and  most  com-
       monly  used  form  is an	entry that uses	the Load keyword, as described
       here:

       Load  "modulename"
	      This instructs the server	to load	the module called  modulename.
	      The  module name given should be the module's standard name, not
	      the module file name.  The standard name is case-sensitive,  and
	      does  not	 include the "lib" prefix, or the ".a",	".o", or ".so"
	      suffixes.

	      Example: the DRI extension module	can be loaded with the follow-
	      ing entry:

		  Load "dri"

       Disable	"modulename"
	      This  instructs the server to not	load the module	called module-
	      name.  Some modules are loaded by	default	 in  the  server,  and
	      this  overrides that default. If a Load instruction is given for
	      the same module, it overrides the	Disable	 instruction  and  the
	      module  is  loaded. The module name given	should be the module's
	      standard name, not the module file name. As with	the  Load  in-
	      struction, the standard name is case-sensitive, and does not in-
	      clude the	"lib" prefix, or the ".a", ".o", or ".so" suffixes.

       The second form of entry	is a SubSection, with the subsection name  be-
       ing  the	 module	name, and the contents of the SubSection being Options
       that are	passed to the module when it is	loaded.

       Example:	the extmod module (which contains  a  miscellaneous  group  of
       server  extensions)  can	be loaded, with	the XFree86-DGA	extension dis-
       abled by	using the following entry:

	   SubSection "extmod"
	      Option  "omit XFree86-DGA"
	   EndSubSection

       Modules are searched for	in each	directory specified in the  ModulePath
       search  path, and in the	drivers, extensions, input, internal, and mul-
       timedia subdirectories of each of those directories.   In  addition  to
       this,  operating	 system	 specific  subdirectories of all the above are
       searched	first if they exist.

       To see what extension modules are available, check the extensions  sub-
       directory under:

	   /usr/local/lib/xorg/modules

       The  "extmod", "dbe", "dri", "dri2", "glx", and "record"	extension mod-
       ules are	loaded automatically, if they  are  present,  unless  disabled
       with  "Disable"	entries.   It  is  recommended	that at	very least the
       "extmod"	extension module be loaded.  If	it isn't, some	commonly  used
       server extensions (like the SHAPE extension) will not be	available.

EXTENSIONS SECTION
       The Extensions section is used to specify which X11 protocol extensions
       should be enabled or disabled.  The Extensions section is optional,  as
       are all of the entries that may be specified in it.

       Entries	in  this section are listed as Option statements with the name
       of the extension	as the first argument, and a boolean value as the sec-
       ond.   The extension name is case-sensitive, and	matches	the form shown
       in the output of	"Xorg -extension ?".

	      Example: the MIT-SHM extension can be disabled with the  follow-
	      ing entry:

		  Section "Extensions"
		      Option "MIT-SHM" "Disable"
		  EndSection

INPUTDEVICE SECTION
       The  config  file  may  have  multiple  InputDevice sections.  Recent X
       servers employ input hotplugging	to add input  devices,	with  the  HAL
       backend	being  the default backend for X servers since 1.4. It is usu-
       ally not	necessary to provide InputDevice sections in the xorg.conf  if
       hotplugging is enabled.

       If  hotplugging	is  disabled, there will normally be at	least two: one
       for the core (primary) keyboard and one for the core pointer.   If  ei-
       ther  of	 these two is missing, a default configuration for the missing
       ones will be used. In the absence of an explicitly specified core input
       device,	the  first InputDevice marked as CorePointer (or CoreKeyboard)
       is used.	 If there is no	match there, the first InputDevice  that  uses
       the  "mouse"  (or  "kbd") driver	is used.  The final fallback is	to use
       built-in	default	configurations.	 Currently the	default	 configuration
       may not work as expected	on all platforms.

       InputDevice sections have the following format:

	   Section "InputDevice"
	       Identifier "name"
	       Driver	  "inputdriver"
	       options
	       ...
	   EndSection

       The  Identifier and Driver entries are required in all InputDevice sec-
       tions.  All other entries are optional.

       The Identifier entry specifies the unique name for this	input  device.
       The Driver entry	specifies the name of the driver to use	for this input
       device.	When using the loadable	server,	the input driver  module  "in-
       putdriver"  will	be loaded for each active InputDevice section.	An In-
       putDevice section is considered active if it is referenced by an	active
       ServerLayout  section, if it is referenced by the -keyboard or -pointer
       command line options, or	if it  is  selected  implicitly	 as  the  core
       pointer	or keyboard device in the absence of such explicit references.
       The most	commonly used input drivers are	evdev(4) on Linux systems, and
       kbd(4) and mousedrv(4) on other platforms.

       InputDevice  sections  recognise	some driver-independent	Options, which
       are described here.  See	the individual input driver manual pages for a
       description of the device-specific options.

       Option "CorePointer"
	      Deprecated, use SendCoreEvents instead.

       Option "CoreKeyboard"
	      Deprecated, use SendCoreEvents instead.

       Option "AlwaysCore"  "boolean"
	      Deprecated, use SendCoreEvents instead.

       Option "SendCoreEvents"	"boolean"
	      Both of these options are	equivalent, and	when enabled cause the
	      input device to report core events through  the  master  device.
	      They are enabled by default.  Any	device configured to send core
	      events will be attached to the virtual core pointer or  keyboard
	      and  control  the	cursor by default. Devices with	SendCoreEvents
	      disabled will be "floating" and only accessible by  clients  em-
	      ploying  the X Input extension. This option controls the startup
	      behavior only, a device may be reattached	 or  set  floating  at
	      runtime.

       Option "SendDragEvents"	"boolean"
	      Send core	events while dragging. Enabled by default.

       For  pointing devices, the following options control how	the pointer is
       accelerated or decelerated with respect to physical device motion. Most
       of these	can be adjusted	at runtime, see	the xinput(1) man page for de-
       tails. Only the most important acceleration options are discussed here.

       Option "AccelerationProfile"  "integer"
	      Select the profile. In layman's terms, the  profile  constitutes
	      the "feeling" of the acceleration. More formally,	it defines how
	      the transfer function (actual acceleration as a function of cur-
	      rent  device velocity and	acceleration controls) is constructed.
	      This is mainly a matter of personal preference.

	      0	     classic (mostly compatible)
	     -1	     none (only	constant deceleration is applied)
	      1	     device-dependent
	      2	     polynomial	(polynomial function)
	      3	     smooth linear (soft knee, then linear)
	      4	     simple (normal when slow, otherwise accelerated)
	      5	     power (power function)
	      6	     linear (more speed, more acceleration)

       Option "ConstantDeceleration"  "real"
	      Makes the	pointer	go deceleration	times slower than normal. Most
	      useful for high-resolution devices.

       Option "AdaptiveDeceleration"  "real"
	      Allows  to  actually  decelerate the pointer when	going slow. At
	      most, it will be adaptive	 deceleration  times  slower.  Enables
	      precise pointer placement	without	sacrificing speed.

       Option "AccelerationScheme"  "string"
	      Selects the scheme, which	is the underlying algorithm.

	      predictable   default algorithm (behaving	more predictable)
	      lightweight   old	acceleration code (as specified	in the X protocol spec)
	      none	    no acceleration or deceleration

DEVICE SECTION
       The  config  file  may have multiple Device sections.  There must be at
       least one, for the video	card being used.

       Device sections have the	following format:

	   Section "Device"
	       Identifier "name"
	       Driver	  "driver"
	       entries
	       ...
	   EndSection

       The Identifier and Driver entries are required in all Device  sections.
       All other entries are optional.

       The  Identifier	entry  specifies the unique name for this graphics de-
       vice.  The Driver entry specifies the name of the  driver  to  use  for
       this  graphics device.  When using the loadable server, the driver mod-
       ule "driver" will be loaded for each active Device section.   A	Device
       section	is  considered	active if it is	referenced by an active	Screen
       section.

       Device sections recognise some driver-independent entries and  Options,
       which are described here.  Not all drivers make use of these driver-in-
       dependent entries, and many of those that do don't require them	to  be
       specified because the information is auto-detected.  See	the individual
       graphics	driver manual pages for	further	information  about  this,  and
       for  a  description  of the device-specific options.  Note that most of
       the Options listed here (but not	the other entries) may be specified in
       the Screen section instead of here in the Device	section.

       BusID  "bus-id"
	      This  specifies  the  bus	 location  of  the graphics card.  For
	      PCI/AGP cards,  the  bus-id  string  has	the  form  PCI:bus:de-
	      vice:function (e.g., "PCI:1:0:0" might be	appropriate for	an AGP
	      card).  This field is usually optional in	single-head configura-
	      tions  when using	the primary graphics card.  In multi-head con-
	      figurations, or when using a secondary graphics card in  a  sin-
	      gle-head	configuration, this entry is mandatory.	 Its main pur-
	      pose is to make an unambiguous  connection  between  the	device
	      section  and  the	hardware it is representing.  This information
	      can usually be found by running the pciaccess tool scanpci.

       Screen  number
	      This option is mandatory for cards where a single	PCI entity can
	      drive more than one display (i.e., multiple CRTCs	sharing	a sin-
	      gle graphics accelerator and video memory).  One Device  section
	      is  required  for	each head, and this parameter determines which
	      head each	of the Device sections applies to.  The	 legal	values
	      of  number  range	 from  0  to one less than the total number of
	      heads per	entity.	 Most drivers require that the primary	screen
	      (0) be present.

       Chipset	"chipset"
	      This  usually  optional  entry specifies the chipset used	on the
	      graphics board.  In most cases this entry	is  not	 required  be-
	      cause  the  drivers  will	 probe	the  hardware to determine the
	      chipset type.  Don't specify it unless the driver-specific docu-
	      mentation	recommends that	you do.

       Ramdac  "ramdac-type"
	      This  optional  entry  specifies	the type of RAMDAC used	on the
	      graphics board.  This is only used by a few of the drivers,  and
	      in  most cases it	is not required	because	the drivers will probe
	      the hardware to determine	the RAMDAC type	where possible.	 Don't
	      specify  it  unless the driver-specific documentation recommends
	      that you do.

       DacSpeed	 speed

       DacSpeed	 speed-8 speed-16 speed-24 speed-32
	      This optional entry specifies the	RAMDAC speed rating (which  is
	      usually printed on the RAMDAC chip).  The	speed is in MHz.  When
	      one value	is given, it applies to	all framebuffer	 pixel	sizes.
	      When  multiple  values  are given, they apply to the framebuffer
	      pixel sizes 8, 16, 24 and	32 respectively.  This is not used  by
	      many drivers, and	only needs to be specified when	the speed rat-
	      ing of the RAMDAC	is different from the  defaults	 built	in  to
	      driver,  or  when	 the  driver can't auto-detect the correct de-
	      faults.  Don't specify it	unless the driver-specific  documenta-
	      tion recommends that you do.

       Clocks  clock ...
	      specifies	the pixel that are on your graphics board.  The	clocks
	      are in MHz, and may be specified as  a  floating	point  number.
	      The value	is stored internally to	the nearest kHz.  The ordering
	      of the clocks is important.  It must match the  order  in	 which
	      they  are	selected on the	graphics board.	 Multiple Clocks lines
	      may be specified,	and each is concatenated  to  form  the	 list.
	      Most  drivers do not use this entry, and it is only required for
	      some older boards	with non-programmable clocks.	Don't  specify
	      this  entry  unless the driver-specific documentation explicitly
	      recommends that you do.

       ClockChip  "clockchip-type"
	      This optional entry is used to specify the clock	chip  type  on
	      graphics boards which have a programmable	clock generator.  Only
	      a	few Xorg drivers support programmable clock  chips.   For  de-
	      tails, see the appropriate driver	manual page.

       VideoRam	 mem
	      This  optional  entry  specifies the amount of video ram that is
	      installed	on the graphics	board.	This is	 measured  in  kBytes.
	      In  most	cases  this  is	 not  required because the Xorg	server
	      probes the graphics  board  to  determine	 this  quantity.   The
	      driver-specific  documentation  should indicate when it might be
	      needed.

       BiosBase	 baseaddress
	      This optional entry specifies the	base address of	the video BIOS
	      for  the VGA board.  This	address	is normally auto-detected, and
	      should only be specified if  the	driver-specific	 documentation
	      recommends it.

       MemBase	baseaddress
	      This  optional  entry  specifies	the  memory  base address of a
	      graphics board's linear frame buffer.  This entry	is not used by
	      many drivers, and	it should only be specified if the driver-spe-
	      cific documentation recommends it.

       IOBase  baseaddress
	      This optional entry specifies the	IO base	address.   This	 entry
	      is  not used by many drivers, and	it should only be specified if
	      the driver-specific documentation	recommends it.

       ChipID  id
	      This optional entry specifies a numerical	 ID  representing  the
	      chip  type.   For	 PCI cards, it is usually the device ID.  This
	      can be used to override the auto-detection, but that should only
	      be done when the driver-specific documentation recommends	it.

       ChipRev	rev
	      This  optional  entry  specifies the chip	revision number.  This
	      can be used to override the auto-detection, but that should only
	      be done when the driver-specific documentation recommends	it.

       TextClockFreq  freq
	      This  optional entry specifies the pixel clock frequency that is
	      used for the regular text	mode.  The frequency is	 specified  in
	      MHz.  This is rarely used.

       Option "ModeDebug" "boolean"
	      Enable  printing of additional debugging information about mode-
	      setting to the server log.

       Options
	      Option flags may be specified in the Device sections.  These in-
	      clude  driver-specific  options  and driver-independent options.
	      The former are described in the  driver-specific	documentation.
	      Some  of the latter are described	below in the section about the
	      Screen section, and they may also	be included here.

VIDEOADAPTOR SECTION
       Nobody wants to say how this works.  Maybe nobody knows ...

MONITOR	SECTION
       The config file may have	multiple Monitor sections.  There should  nor-
       mally  be  at least one,	for the	monitor	being used, but	a default con-
       figuration will be created when one isn't specified.

       Monitor sections	have the following format:

	   Section "Monitor"
	       Identifier "name"
	       entries
	       ...
	   EndSection

       The only	mandatory entry	in a Monitor section is	the Identifier entry.

       The Identifier entry specifies the unique name for this	monitor.   The
       Monitor section may be used to provide information about	the specifica-
       tions of	the monitor, monitor-specific Options, and  information	 about
       the video modes to use with the monitor.

       With  RandR  1.2-enabled	 drivers, monitor sections may be tied to spe-
       cific outputs of	the video card.	 Using the name	of the output  defined
       by the video driver plus	the identifier of a monitor section, one asso-
       ciates a	monitor	section	with an	output by adding an option to the  De-
       vice section in the following format:

       Option "Monitor-outputname" "monitorsection"

       (for example, Option "Monitor-VGA" "VGA monitor"	for a VGA output)

       In  the absence of specific association of monitor sections to outputs,
       if a monitor section is present the server will associate  it  with  an
       output  to  preserve  compatibility for previous	single-head configura-
       tions.

       Specifying video	modes is optional because the server will use the  DDC
       or other	information provided by	the monitor to automatically configure
       the list	of modes available.  When modes	are  specified	explicitly  in
       the  Monitor  section (with the Modes, ModeLine,	or UseModes keywords),
       built-in	modes with the same names are not  included.   Built-in	 modes
       with different names are, however, still	implicitly included, when they
       meet the	requirements of	the monitor.

       The entries that	may be used in Monitor sections	are described below.

       VendorName  "vendor"
	      This optional entry specifies the	monitor's manufacturer.

       ModelName  "model"
	      This optional entry specifies the	monitor's model.

       HorizSync  horizsync-range
	      gives the	range(s) of horizontal sync frequencies	 supported  by
	      the  monitor.   horizsync-range may be a comma separated list of
	      either discrete values or	ranges of values.  A range  of	values
	      is two values separated by a dash.  By default the values	are in
	      units of kHz.  They may be specified in MHz or Hz	if MHz	or  Hz
	      is added to the end of the line.	The data given here is used by
	      the Xorg server to determine if video modes are within the spec-
	      ifications of the	monitor.  This information should be available
	      in the monitor's handbook.  If this entry	is omitted, a  default
	      range of 28-33kHz	is used.

       VertRefresh  vertrefresh-range
	      gives  the range(s) of vertical refresh frequencies supported by
	      the monitor.  vertrefresh-range may be a comma separated list of
	      either  discrete	values or ranges of values.  A range of	values
	      is two values separated by a dash.  By default the values	are in
	      units  of	Hz.  They may be specified in MHz or kHz if MHz	or kHz
	      is added to the end of the line.	The data given here is used by
	      the Xorg server to determine if video modes are within the spec-
	      ifications of the	monitor.  This information should be available
	      in  the monitor's	handbook.  If this entry is omitted, a default
	      range of 43-72Hz is used.

       DisplaySize  width height
	      This optional entry gives	the width and height, in  millimetres,
	      of  the  picture	area of	the monitor.  If given this is used to
	      calculate	the horizontal and vertical pitch (DPI)	of the screen.

       Gamma  gamma-value

       Gamma  red-gamma	green-gamma blue-gamma
	      This is an optional entry	that can be used to specify the	 gamma
	      correction  for  the  monitor.   It may be specified as either a
	      single value or as three separate	RGB values.  The values	should
	      be  in  the  range 0.1 to	10.0, and the default is 1.0.  Not all
	      drivers are capable of using this	information.

       UseModes	 "modesection-id"
	      Include the set of modes listed in the Modes section called mod-
	      esection-id.   This  makes all of	the modes defined in that sec-
	      tion available for use by	this monitor.

       Mode  "name"
	      This is an optional multi-line entry that	can be used to provide
	      definitions for video modes for the monitor.  In most cases this
	      isn't necessary because the built-in set of VESA standard	 modes
	      will  be	sufficient.  The Mode keyword indicates	the start of a
	      multi-line video mode description.  The mode description is ter-
	      minated with the EndMode keyword.	 The mode description consists
	      of the following entries:

	      DotClock	clock
		  is the dot (pixel) clock rate	to be used for the mode.

	      HTimings	hdisp hsyncstart hsyncend htotal
		  specifies the	horizontal timings for the mode.

	      VTimings	vdisp vsyncstart vsyncend vtotal
		  specifies the	vertical timings for the mode.

	      Flags  "flag" ...
		  specifies an optional	set of mode flags, each	of which is  a
		  separate  string  in	double	quotes.	 "Interlace" indicates
		  that the mode	is interlaced.	"DoubleScan" indicates a  mode
		  where	 each  scanline	is doubled.  "+HSync" and "-HSync" can
		  be  used  to	select	the  polarity  of  the	HSync  signal.
		  "+VSync"  and	"-VSync" can be	used to	select the polarity of
		  the VSync signal.  "Composite" can be	used to	 specify  com-
		  posite  sync on hardware where this is supported.  Addition-
		  ally,	on some	hardware, "+CSync" and "-CSync"	may be used to
		  select the composite sync polarity.

	      HSkew  hskew
		  specifies  the  number  of pixels (towards the right edge of
		  the screen) by which the display  enable  signal  is	to  be
		  skewed.   Not	all drivers use	this information.  This	option
		  might	become necessary to override the  default  value  sup-
		  plied	by the server (if any).	 "Roving" horizontal lines in-
		  dicate this value needs to be	increased.  If	the  last  few
		  pixels on a scan line	appear on the left of the screen, this
		  value	should be decreased.

	      VScan  vscan
		  specifies the	number of times	each scanline  is  painted  on
		  the  screen.	 Not all drivers use this information.	Values
		  less than 1 are treated as 1,	which is the default.	Gener-
		  ally,	 the  "DoubleScan"  Flag  mentioned above doubles this
		  value.

       ModeLine	 "name"	mode-description
	      This entry is a more compact version of the Mode entry,  and  it
	      also  can	 be used to specify video modes	for the	monitor.  is a
	      single line format for specifying	video modes.   In  most	 cases
	      this  isn't  necessary because the built-in set of VESA standard
	      modes will be sufficient.

	      The mode-description is in four sections,	 the  first  three  of
	      which  are mandatory.  The first is the dot (pixel) clock.  This
	      is a single number specifying the	pixel clock rate for the  mode
	      in MHz.  The second section is a list of four numbers specifying
	      the horizontal timings.  These numbers  are  the	hdisp,	hsync-
	      start, hsyncend, and htotal values.  The third section is	a list
	      of four numbers specifying the vertical timings.	These  numbers
	      are the vdisp, vsyncstart, vsyncend, and vtotal values.  The fi-
	      nal section is a list of flags specifying	other  characteristics
	      of  the  mode.  Interlace	indicates that the mode	is interlaced.
	      DoubleScan indicates a mode  where  each	scanline  is  doubled.
	      +HSync  and  -HSync  can	be  used to select the polarity	of the
	      HSync signal.  +VSync and	-VSync can be used to select  the  po-
	      larity  of  the  VSync signal.  Composite	can be used to specify
	      composite	sync on	hardware where this is	supported.   Addition-
	      ally,  on	some hardware, +CSync and -CSync may be	used to	select
	      the composite sync polarity.  The	HSkew and VScan	 options  men-
	      tioned  above  in	 the  Modes entry description can also be used
	      here.

       Option "DPMS"  "bool"
	      This option controls whether the server should enable  the  DPMS
	      extension	 for power management for this screen.	The default is
	      to enable	the extension.

       Option "SyncOnGreen"  "bool"
	      This option controls whether the video  card  should  drive  the
	      sync  signal on the green	color pin.  Not	all cards support this
	      option, and most monitors	do not require	it.   The  default  is
	      off.

       Option "Primary"	 "bool"
	      This optional entry specifies that the monitor should be treated
	      as the primary monitor. (RandR 1.2-supporting drivers only)  Op-
	      tion  "PreferredMode"   "string" This optional entry specifies a
	      mode to be marked	as the preferred initial mode of the  monitor.
	      (RandR 1.2-supporting drivers only)

       Option "Position"  "x y"
	      This optional entry specifies the	position of the	monitor	within
	      the X screen.  (RandR 1.2-supporting drivers only)

       Option "LeftOf"	"output"
	      This optional entry specifies that the monitor should  be	 posi-
	      tioned  to  the  left  of	 the output (not monitor) of the given
	      name.  (RandR 1.2-supporting drivers only)

       Option "RightOf"	 "output"
	      This optional entry specifies that the monitor should  be	 posi-
	      tioned  to  the  right  of the output (not monitor) of the given
	      name.  (RandR 1.2-supporting drivers only)

       Option "Above"  "output"
	      This optional entry specifies that the monitor should  be	 posi-
	      tioned above the output (not monitor) of the given name.	(RandR
	      1.2-supporting drivers only)

       Option "Below"  "output"
	      This optional entry specifies that the monitor should  be	 posi-
	      tioned below the output (not monitor) of the given name.	(RandR
	      1.2-supporting drivers only)

       Option "Enable"	"bool"
	      This optional entry specifies  whether  the  monitor  should  be
	      turned  on  at  startup.	By default, the	server will attempt to
	      enable all connected monitors.   (RandR  1.2-supporting  drivers
	      only)

       Option "MinClock"  "frequency"
	      This  optional  entry  specifies	the minimum dot	clock, in kHz,
	      that is supported	by the monitor.

       Option "MaxClock"  "frequency"
	      This optional entry specifies the	maximum	 dot  clock,  in  kHz,
	      that is supported	by the monitor.

       Option "Ignore"	"bool"
	      This optional entry specifies that the monitor should be ignored
	      entirely,	and not	reported through RandR.	 This is useful	if the
	      hardware	reports	 the  presence	of  outputs  that don't	exist.
	      (RandR 1.2-supporting drivers only)

       Option "Rotate"	"rotation"
	      This optional entry specifies the	initial	rotation of the	 given
	      monitor.	 Valid	values	for  rotation  are  "normal",  "left",
	      "right", and "inverted".	(RandR 1.2-supporting drivers only)

MODES SECTION
       The config file may have	multiple Modes sections, or none.  These  sec-
       tions  provide  a  way of defining sets of video	modes independently of
       the Monitor sections.  Monitor sections	may  include  the  definitions
       provided	 in  these  sections  by  using	the UseModes keyword.  In most
       cases the Modes sections	are not	necessary because the built-in set  of
       VESA standard modes will	be sufficient.

       Modes sections have the following format:

	   Section "Modes"
	       Identifier "name"
	       entries
	       ...
	   EndSection

       The Identifier entry specifies the unique name for this set of mode de-
       scriptions.  The	other entries permitted	in Modes sections are the Mode
       and ModeLine entries that are described above in	the Monitor section.

SCREEN SECTION
       The  config  file  may have multiple Screen sections.  There must be at
       least one, for the "screen" being  used.	  A  "screen"  represents  the
       binding	of  a  graphics	device (Device section)	and a monitor (Monitor
       section).  A Screen section is considered "active" if it	is  referenced
       by  an  active  ServerLayout section or by the -screen command line op-
       tion.  If neither of those is present, the first	Screen	section	 found
       in the config file is considered	the active one.

       Screen sections have the	following format:

	   Section "Screen"
	       Identifier "name"
	       Device	  "devid"
	       Monitor	  "monid"
	       entries
	       ...
	       SubSection "Display"
		  entries
		  ...
	       EndSubSection
	       ...
	   EndSection

       The  Identifier	and  Device entries are	mandatory.  All	others are op-
       tional.

       The Identifier entry specifies the unique name for  this	 screen.   The
       Screen  section	provides information specific to the whole screen, in-
       cluding screen-specific Options.	 In multi-head	configurations,	 there
       will  be	 multiple  active Screen sections, one for each	head.  The en-
       tries available for this	section	are:

       Device  "device-id"
	      This mandatory entry specifies the Device	section	to be used for
	      this  screen.   This  is what ties a specific graphics card to a
	      screen.  The device-id must match	the  Identifier	 of  a	Device
	      section in the config file.

       Monitor	"monitor-id"
	      specifies	 which	monitor	 description  is  to  be used for this
	      screen.  If a Monitor name is not	specified, a default  configu-
	      ration  is  used.	  Currently  the default configuration may not
	      function as expected on all platforms.

       VideoAdaptor  "xv-id"
	      specifies	an optional Xv video adaptor description  to  be  used
	      with this	screen.

       DefaultDepth  depth
	      specifies	 which	color  depth the server	should use by default.
	      The -depth command line option can be used to override this.  If
	      neither  is specified, the default depth is driver-specific, but
	      in most cases is 8.

       DefaultFbBpp  bpp
	      specifies	which framebuffer  layout  to  use  by	default.   The
	      -fbbpp  command  line  option  can be used to override this.  In
	      most cases the driver will chose	the  best  default  value  for
	      this.   The only case where there	is even	a choice in this value
	      is for depth 24, where some hardware supports both a  packed  24
	      bit framebuffer layout and a sparse 32 bit framebuffer layout.

       Options
	      Various  Option  flags  may  be specified	in the Screen section.
	      Some are driver-specific and are described in the	 driver	 docu-
	      mentation.   Others  are driver-independent, and will eventually
	      be described here.

       Option "Accel"
	      Enables XAA (X  Acceleration  Architecture),  a  mechanism  that
	      makes  video  cards'  2D	hardware acceleration available	to the
	      Xorg server.  This option	is on by default, but it may be	neces-
	      sary  to turn it off if there are	bugs in	the driver.  There are
	      many options to disable specific accelerated operations,	listed
	      below.   Note that disabling an operation	will have no effect if
	      the operation is not accelerated (whether	due to lack of support
	      in the hardware or in the	driver).

       Option "InitPrimary" "boolean"
	      Use  the	Int10  module to initialize the	primary	graphics card.
	      Normally,	only secondary cards are soft-booted using  the	 Int10
	      module,  as the primary card has already been initialized	by the
	      BIOS at boot time.  Default: false.

       Option "NoInt10"	"boolean"
	      Disables the Int10 module, a module that uses the	int10 call  to
	      the BIOS of the graphics card to initialize it.  Default:	false.

       Option "NoMTRR"
	      Disables MTRR (Memory Type Range Register) support, a feature of
	      modern processors	which can improve video	performance by a  fac-
	      tor  of  up  to  2.5.  Some hardware has buggy MTRR support, and
	      some video drivers have been  known  to  exhibit	problems  when
	      MTRR's are used.

       Option "XaaNoCPUToScreenColorExpandFill"
	      Disables	accelerated  rectangular  expansion  blits from	source
	      patterns stored in system	memory (using  a  memory-mapped	 aper-
	      ture).

       Option "XaaNoColor8x8PatternFillRect"
	      Disables	accelerated  fills  of	a  rectangular	region	with a
	      full-color pattern.

       Option "XaaNoColor8x8PatternFillTrap"
	      Disables accelerated  fills  of  a  trapezoidal  region  with  a
	      full-color pattern.

       Option "XaaNoDashedBresenhamLine"
	      Disables accelerated dashed Bresenham line draws.

       Option "XaaNoDashedTwoPointLine"
	      Disables	accelerated  dashed  line  draws between two arbitrary
	      points.

       Option "XaaNoImageWriteRect"
	      Disables accelerated transfers of	 full-color  rectangular  pat-
	      terns  from system memory	to video memory	(using a memory-mapped
	      aperture).

       Option "XaaNoMono8x8PatternFillRect"
	      Disables accelerated fills of a rectangular region with a	 mono-
	      chrome pattern.

       Option "XaaNoMono8x8PatternFillTrap"
	      Disables	accelerated fills of a trapezoidal region with a mono-
	      chrome pattern.

       Option "XaaNoOffscreenPixmaps"
	      Disables accelerated draws  into	pixmaps	 stored	 in  offscreen
	      video memory.

       Option "XaaNoPixmapCache"
	      Disables caching of patterns in offscreen	video memory.

       Option "XaaNoScanlineCPUToScreenColorExpandFill"
	      Disables	accelerated  rectangular  expansion  blits from	source
	      patterns stored in system	memory (one scan line at a time).

       Option "XaaNoScanlineImageWriteRect"
	      Disables accelerated transfers of	 full-color  rectangular  pat-
	      terns  from  system  memory  to video memory (one	scan line at a
	      time).

       Option "XaaNoScreenToScreenColorExpandFill"
	      Disables accelerated rectangular	expansion  blits  from	source
	      patterns stored in offscreen video memory.

       Option "XaaNoScreenToScreenCopy"
	      Disables accelerated copies of rectangular regions from one part
	      of video memory to another part of video memory.

       Option "XaaNoSolidBresenhamLine"
	      Disables accelerated solid Bresenham line	draws.

       Option "XaaNoSolidFillRect"
	      Disables accelerated solid-color fills of	rectangles.

       Option "XaaNoSolidFillTrap"
	      Disables accelerated solid-color fills of	Bresenham trapezoids.

       Option "XaaNoSolidHorVertLine"
	      Disables accelerated solid horizontal and	vertical line draws.

       Option "XaaNoSolidTwoPointLine"
	      Disables accelerated solid  line	draws  between	two  arbitrary
	      points.

       Each  Screen section may	optionally contain one or more Display subsec-
       tions.  Those subsections provide  depth/fbbpp  specific	 configuration
       information,  and the one chosen	depends	on the depth and/or fbbpp that
       is being	used for the screen.  The Display  subsection  format  is  de-
       scribed in the section below.

DISPLAY	SUBSECTION
       Each  Screen  section  may have multiple	Display	subsections.  The "ac-
       tive" Display subsection	is the first that  matches  the	 depth	and/or
       fbbpp  values being used, or failing that, the first that has neither a
       depth or	fbbpp value specified.	The Display subsections	are  optional.
       When  there  isn't one that matches the depth and/or fbbpp values being
       used, all the parameters	that can be specified here fall	back to	 their
       defaults.

       Display subsections have	the following format:

	       SubSection "Display"
		   Depth  depth
		   entries
		   ...
	       EndSubSection

       Depth  depth
	      This entry specifies what	colour depth the Display subsection is
	      to be used for.  This entry is usually specified,	but it may  be
	      omitted to create	a match-all Display subsection or when wishing
	      to match only against the	FbBpp parameter.  The range  of	 depth
	      values  that  are	 allowed  depends on the driver.  Most drivers
	      support 8, 15, 16	and 24.	 Some also support  1  and/or  4,  and
	      some  may	support	other values (like 30).	 Note: depth means the
	      number of	bits in	a pixel	that are actually  used	 to  determine
	      the pixel	colour.	 32 is not a valid depth value.	 Most hardware
	      that uses	32 bits	per pixel only uses 24 of  them	 to  hold  the
	      colour information, which	means that the colour depth is 24, not
	      32.

       FbBpp  bpp
	      This entry specifies the framebuffer format this Display subsec-
	      tion  is to be used for.	This entry is only needed when provid-
	      ing depth	24 configurations that allow a choice between a	24 bpp
	      packed framebuffer format	and a 32bpp sparse framebuffer format.
	      In most cases this entry should not be used.

       Weight  red-weight green-weight blue-weight
	      This optional entry specifies the	relative RGB weighting	to  be
	      used for a screen	is being used at depth 16 for drivers that al-
	      low multiple formats.  This may also be specified	from the  com-
	      mand line	with the -weight option	(see Xorg(1)).

       Virtual	xdim ydim
	      This  optional  entry specifies the virtual screen resolution to
	      be used.	xdim must be a multiple	of either 8  or	 16  for  most
	      drivers,	and  a multiple	of 32 when running in monochrome mode.
	      The given	value will be rounded down if this is  not  the	 case.
	      Video  modes  which are too large	for the	specified virtual size
	      will be rejected.	 If this entry is  not	present,  the  virtual
	      screen resolution	will be	set to accommodate all the valid video
	      modes given in the Modes entry.  Some drivers/hardware  combina-
	      tions  do	not support virtual screens.  Refer to the appropriate
	      driver-specific documentation for	details.

       ViewPort	 x0 y0
	      This optional entry sets the upper left corner  of  the  initial
	      display.	 This is only relevant when the	virtual	screen resolu-
	      tion is different	from the resolution of the initial video mode.
	      If  this	entry  is  not given, then the initial display will be
	      centered in the virtual display area.

       Modes  "mode-name" ...
	      This optional entry specifies the	list of	video  modes  to  use.
	      Each  mode-name  specified  must be in double quotes.  They must
	      correspond to those specified or referenced in  the  appropriate
	      Monitor  section	(including implicitly referenced built-in VESA
	      standard modes).	The server will	delete modes  from  this  list
	      which  don't satisfy various requirements.  The first valid mode
	      in this list will	be the default display mode for	startup.   The
	      list  of	valid  modes  is  converted internally into a circular
	      list.   It  is  possible	to  switch  to	the  next  mode	  with
	      Ctrl+Alt+Keypad-Plus and to the previous mode with Ctrl+Alt+Key-
	      pad-Minus.  When this entry is omitted, the valid	 modes	refer-
	      enced  by	 the appropriate Monitor section will be used.	If the
	      Monitor section contains no modes, then the  selection  will  be
	      taken from the built-in VESA standard modes.

       Visual  "visual-name"
	      This optional entry sets the default root	visual type.  This may
	      also be specified	from the command line (see the Xserver(1)  man
	      page).   The  visual types available for depth 8 are (default is
	      PseudoColor):

		  StaticGray
		  GrayScale
		  StaticColor
		  PseudoColor
		  TrueColor
		  DirectColor

	      The visual type available	for the	depths 15, 16 and 24 are  (de-
	      fault is TrueColor):

		  TrueColor
		  DirectColor

	      Not all drivers support DirectColor at these depths.

	      The visual types available for the depth 4 are (default is Stat-
	      icColor):

		  StaticGray
		  GrayScale
		  StaticColor
		  PseudoColor

	      The visual type available	for the	depth 1	(monochrome) is	 Stat-
	      icGray.

       Black  red green	blue
	      This  optional  entry allows the "black" colour to be specified.
	      This is only supported at	depth 1.  The default is black.

       White  red green	blue
	      This optional entry allows the "white" colour to	be  specified.
	      This is only supported at	depth 1.  The default is white.

       Options
	      Option flags may be specified in the Display subsections.	 These
	      may include driver-specific options and  driver-independent  op-
	      tions.  The former are described in the driver-specific documen-
	      tation.  Some of the latter are described	above in  the  section
	      about the	Screen section,	and they may also be included here.

SERVERLAYOUT SECTION
       The  config  file  may  have multiple ServerLayout sections.  A "server
       layout" represents the binding of one or	more screens (Screen sections)
       and one or more input devices (InputDevice sections) to form a complete
       configuration.  In multi-head configurations,  it  also	specifies  the
       relative	 layout	 of  the  heads.  A ServerLayout section is considered
       "active"	if it is referenced by the -layout command line	option	or  by
       an  Option  "DefaultServerLayout" entry in the ServerFlags section (the
       former takes precedence over the	latter).  If  those  options  are  not
       used,  the  first ServerLayout section found in the config file is con-
       sidered the active one.	If no ServerLayout sections are	 present,  the
       single  active  screen and two active (core) input devices are selected
       as described in the relevant sections above.

       ServerLayout sections have the following	format:

	   Section "ServerLayout"
	       Identifier   "name"
	       Screen	    "screen-id"
	       ...
	       InputDevice  "idev-id"
	       ...
	       options
	       ...
	   EndSection

       Each ServerLayout section must have an Identifier entry	and  at	 least
       one Screen entry.

       The  Identifier entry specifies the unique name for this	server layout.
       The ServerLayout	section	provides information  specific	to  the	 whole
       session,	 including  session-specific Options.  The ServerFlags options
       (described above) may be	specified here,	and ones given	here  override
       those given in the ServerFlags section.

       The entries that	may be used in this section are	described here.

       Screen  screen-num "screen-id" position-information
	      One of these entries must	be given for each screen being used in
	      a	session.  The screen-id	field is mandatory, and	specifies  the
	      Screen  section  being  referenced.  The screen-num field	is op-
	      tional, and  may	be  used  to  specify  the  screen  number  in
	      multi-head  configurations.   When  this	field  is omitted, the
	      screens will be numbered in the order that they are  listed  in.
	      The numbering starts from	0, and must be consecutive.  The posi-
	      tion-information field describes the way	multiple  screens  are
	      positioned.   There are a	number of different ways that this in-
	      formation	can be provided:

	      x	y

	      Absolute	x y
		  These	both specify that the upper left corner's  coordinates
		  are  (x,y).	The  Absolute keyword is optional.  Some older
		  versions of XFree86 (4.2 and earlier)	 don't	recognise  the
		  Absolute keyword, so it's safest to just specify the coordi-
		  nates	without	it.

	      RightOf	"screen-id"

	      LeftOf	"screen-id"

	      Above	"screen-id"

	      Below	"screen-id"

	      Relative	"screen-id" x y
		  These	give the screen's location relative to another screen.
		  The first four position the screen immediately to the	right,
		  left,	above or below the other screen.  When positioning  to
		  the  right  or  left,	the top	edges are aligned.  When posi-
		  tioning above	or below, the left  edges  are	aligned.   The
		  Relative  form  specifies  the offset	of the screen's	origin
		  (upper left  corner)	relative  to  the  origin  of  another
		  screen.

       InputDevice  "idev-id" "option" ...
	      One of these entries should be given for each input device being
	      used in a	session.  Normally at least two	are required, one each
	      for  the	core pointer and keyboard devices.  If either of those
	      is missing, suitable InputDevice entries are searched for	 using
	      the  method  described  above  in	 the INPUTDEVICE section.  The
	      idev-id field is mandatory, and specifies	the name of the	Input-
	      Device  section being referenced.	 Multiple option fields	may be
	      specified, each in double	quotes.	 The  options  permitted  here
	      are  any	that  may  also	 be given in the InputDevice sections.
	      Normally only session-specific input  device  options  would  be
	      used here.  The most commonly used options are:

		  "CorePointer"
		  "CoreKeyboard"
		  "SendCoreEvents"

	      and  the	first two should normally be used to indicate the core
	      pointer and core keyboard	devices	respectively.

       Options
	      In addition to  the  following,  any  option  permitted  in  the
	      ServerFlags  section  may	also be	specified here.	 When the same
	      option appears in	both places, the value	given  here  overrides
	      the one given in the ServerFlags section.

       Option "IsolateDevice"  "bus-id"
	      Restrict	device	resets to the specified	bus-id.	 See the BusID
	      option (described	in DEVICE SECTION, above) for  the  format  of
	      the  bus-id  parameter.	This  option  overrides	SingleCard, if
	      specified.  At present, only PCI devices can be isolated in this
	      manner.

       Option "SingleCard"  "boolean"
	      As  IsolateDevice, except	that the bus ID	of the first device in
	      the layout is used.

       Here is an example of a ServerLayout section for	a dual headed configu-
       ration with two mice:

	   Section "ServerLayout"
	       Identifier  "Layout 1"
	       Screen	   "MGA	1"
	       Screen	   "MGA	2" RightOf "MGA	1"
	       InputDevice "Keyboard 1"	"CoreKeyboard"
	       InputDevice "Mouse 1"	"CorePointer"
	       InputDevice "Mouse 2"	"SendCoreEvents"
	       Option	   "BlankTime"	"5"
	   EndSection

DRI SECTION
       This  optional  section is used to provide some information for the Di-
       rect Rendering Infrastructure.  Details about the format	of  this  sec-
       tion  can  be found in the README.DRI document, which is	also available
       on-line at _http://dri.freedesktop.org/_.

VENDOR SECTION
       The optional Vendor section may be used to provide vendor-specific con-
       figuration  information.	  Multiple Vendor sections may be present, and
       they may	contain	an Identifier entry and	multiple  Option  flags.   The
       data therein is not used	in this	release.

SEE ALSO
       General:	X(7), Xserver(1), Xorg(1), cvt(1), gtf(1).

       Not all modules or interfaces are available on all platforms.

       Display	drivers:  apm(4),  ati(4),  chips(4), cirrus(4), cyrix(4), fb-
       dev(4),	glide(4),  glint(4),  i128(4),	i740(4),  imstt(4),  intel(4),
       mga(4),	neomagic(4),  nv(4), openchrome(4), r128(4), radeon(4),	rendi-
       tion(4),	savage(4), s3virge(4),	siliconmotion(4),  sis(4),  sisusb(4),
       sunbw2(4),  suncg14(4),	suncg3(4),  suncg6(4),	sunffb(4),  sunleo(4),
       suntcx(4),   tdfx(4),   trident(4),   tseng(4),	 vesa(4),   vmware(4),
       voodoo(4), wsfb(4), xgi(4), xgixp(4).

       Input  drivers:	acecad(4),  calcomp(4),	citron(4), dmc(4), dynapro(4),
       elographics(4), evdev(4), fpit(4), js_x(4), joystick(4),	kbd(4),	magic-
       touch(4),   microtouch(4),  mousedrv(4),	 mutouch(4),  palmax(4),  pen-
       mount(4), synaptics(4), tek4957(4), ur98(4), vmmouse(4),	 void(4),  wa-
       com(4).

       Other modules and interfaces: exa(4), fbdevhw(4), v4l(4).

AUTHORS
       This    manual	 page	was   largely	rewritten   by	 David	 Dawes
       _dawes@xfree86.org_.

X Version 11		       xorg-server 1.7.7		  xorg.conf(5)

NAME | INTRODUCTION | DESCRIPTION | FILES SECTION | SERVERFLAGS SECTION | MODULE SECTION | EXTENSIONS SECTION | INPUTDEVICE SECTION | DEVICE SECTION | VIDEOADAPTOR SECTION | MONITOR SECTION | MODES SECTION | SCREEN SECTION | DISPLAY SUBSECTION | SERVERLAYOUT SECTION | DRI SECTION | VENDOR SECTION | SEE ALSO | AUTHORS

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