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s3virge(4)							    s3virge(4)

       s3virge - S3 ViRGE video	driver

       Section "Device"
	 Identifier "devname"
	 Driver	"s3virge"
	 [ Option "optionname" ["optionvalue"]]

       s3virge	is  an XFree86 driver for S3 based video cards.	 The driver is
       fully accelerated, and provides support for the	following  framebuffer
       depths: 8, 15, 16, and 24.  All visual types are	supported for depth 8,
       and TrueColor visuals are supported for the other depths.  XVideo hard-
       ware up scaling is supported in depth 16	and 24 on the DX, GX, GX2, MX,
       MX+, and	Trio3D/2X.  Doublescan modes are supported and tested in depth
       8 and 16	on DX, but disable XVideo.  Doublescan modes on	other chipsets
       are untested.

       The s3virge driver supports PCI and AGP video cards based on  the  fol-
       lowing S3 chips:

       ViRGE	   86C325

       ViRGE VX	   86C988

       ViRGE DX	   86C375

       ViRGE GX	   86C385

       ViRGE GX2   86C357

       ViRGE MX	   86C260

       ViRGE MX+   86C280

       Trio 3D	   86C365

       Trio 3D/2X  86C362, 86C368

       Please  refer to	XF86Config(5) for general configuration	details.  This
       section only covers configuration details specific to this driver.  All
       options	names  are case	and white space	insensitive when parsed	by the
       server, for example,  "virge vx"	and "VIRGEvx" are equivalent.

       The driver auto-detects the chipset type,  but  the  following  ChipSet
       names  may  optionally  be specified in the config file ""Device"" sec-
       tion, and will override the auto-detection:

	   "virge", "86c325", "virge  vx",  "86c988",  "virge  dx",  "86c375",
	   "virge  gx",	"86c385", "virge gx2", "86c357", "virge	mx", "86c260",
	   "virge mx+",	"86c280", "trio	3d", "86c365", "trio 3d/2x", "86c362",

       The following Cursor Options are	supported:

       Option "HWCursor" ["boolean"]
	      Enable or	disable	the HW cursor.	Default: on.

       Option "SWCursor" ["boolean"]
	      Inverse of "HWCursor".  Default: off.

       The following display Options are supported:

       Option "ShadowFB" ["boolean"]
	      Use  shadow  framebuffer.	  Disables  HW acceleration.  Default:

       Option "Rotate" "cw | ccw"
	      Rotate the screen	CW - clockwise or  CCW	-  counter  clockwise.
	      Disables HW Acceleration and HW Cursor, uses ShadowFB.  Default:
	      no rotation.

       Option "XVideo" ["boolean"]
	      Disable XVideo support by	using the off  option.	 This  changes
	      FIFO  settings  which  prevent  screen noise for high-res	modes.
	      Default: on

       The following video memory Options are supported:

       Option "slow_edodram"
	      Switch the standard ViRGE	to 2-cycle edo mode. Try this  if  you
	      encounter	 pixel corruption on the ViRGE.	Using this option will
	      cause a large decrease in	performance.  Default: off.

       Option "fpm_vram"
	      Switch the ViRGE/VX to fast page mode vram mode.	Default:  off.

       Option "slow_dram | fast_dram"
	      Change  Trio  3D	and  3D/2X  memory options.  Default: Use BIOS

       Option "early_ras_precharge | late_ras_precharge"
	      adjust memory parameters.	 One of	these will us  the  same  set-
	      tings as your video card defaults, and using neither in the con-
	      fig file does the	same.  Default:	none.

       Option "set_mclk" "integer"
	      sets the memory clock, where integer is in kHz, and  integer  <=
	      100000.	Default:  probe	 the memory clock value, and use it at
	      server start.

       Option "set_refclk" "integer"
	      sets the ref clock for  ViRGE  MX,  where	 integer  is  in  kHz.
	      Default:	probe  the  memory  clock  value, and use it at	server

       The following acceleration and graphics engine Options are supported:

       Option "NoAccel"
	      Disable acceleration.  Very useful for determining if the	driver
	      has  problems  with  drawing and acceleration routines.  This is
	      the first	option to try if your server runs but you see  graphic
	      corruption on the	screen.	 Using it decreases performance, as it
	      uses software emulation for drawing operations the video	driver
	      can accelerate with hardware.  Default: acceleration is enabled.

       Option "fifo_aggressive | fifo_moderate | fifo_conservative"
	      alter the	settings for the threshold at  which  the  pixel  FIFO
	      takes over the internal memory bus to refill itself. The smaller
	      this threshold, the better the acceleration performance  of  the
	      card. You	may try	the fastest setting (fifo_aggressive) and move
	      down if you encounter pixel  corruption.	 The  optimal  setting
	      will  probably depend on dot-clock and on	color depth. Note that
	      specifying any of	these options will  also  alter	 other	memory
	      settings	which may increase performance,	so trying fifo_conser-
	      vative will in most cases	be a slight  benefit  (this  uses  the
	      chip  defaults).	 If pixel corruption or	transient streaking is
	      observed	during	drawing	 operations  then  removing  any  fifo
	      options is recommended.  Default:	none.

       The following PCI bus Options are supported:

       Option "pci_burst" ["boolean"]
	      will  enable  PCI	 burst mode. This should work on all but a few
	      broken PCI chipsets, and will  increase  performance.   Default:

       Option "pci_retry" ["boolean"]
	      will  allow the driver to	rely on	PCI Retry to program the ViRGE
	      registers.  pci_burst must be enabled for	this  to  work.	  This
	      will  increase  performance,  especially	for small fills/blits,
	      because the driver does not have to poll the ViRGE before	 send-
	      ing it commands to make sure it is ready.	It should work on most
	      recent PCI chipsets.  Default: off.

       The following ViRGE MX LCD Options are supported:

       Option "lcd_center"

       Option "set_lcdclk" "integer"
	      allows setting the clock for a ViRGE MX LCD display.  integer is
	      in Hz.  Default: use probed value.

       The following additional	Options	are supported:

       Option "ShowCache" ["boolean"]
	      Enable or	disable	viewing	offscreen cache	memory.	 A development
	      debug option.  Default: off.

       Option "mx_cr3a_fix" ["boolean"]
	      Enable or	disable	a cr3a fix added for ViRGE MX.	Default: on.

       XFree86(1), XF86Config(5), xf86config(1), Xserver(1), X(7)

       The VideoRam generic driver  parameter  is  presently  ignored  by  the
       s3virge	driver.	  On  PPC  this	 is  reported to cause problems	for 2M
       cards, because they may autodetect as 4M.

       For assistance with this	driver,	 or  XFree86  in  general,  check  the
       XFree86	web site at  A FAQ is available	on the
       web site	at	 If you	find  a	 problem  with
       XFree86	or  have a question not	answered in the	FAQ please use our bug
       report  form  available	 on   the   web	  site	 or   send   mail   to   When  reporting problems with the	driver send as
       much detail as possible,	including chipset type,	a server  output  log,
       and operating system specifics.

       Kevin  Brosius,	Matt Grossman, Harald Koenig, Sebastien	Marineau, Mark

XFree86				 Version 4.7.0			    s3virge(4)


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