Skip site navigation (1)Skip section navigation (2)

FreeBSD Man Pages

Man Page or Keyword Search:
Man Architecture
Apropos Keyword Search (all sections) Output format
home | help
VGA(4)		       FreeBSD Kernel Interfaces Manual			VGA(4)

NAME
     vga -- generic video card interface

SYNOPSIS
     options VESA
     options VESA_DEBUG=N
     options VGA_ALT_SEQACCESS
     options VGA_NO_FONT_LOADING
     options VGA_NO_MODE_CHANGE
     options VGA_SLOW_IOACCESS
     options VGA_WIDTH90
     device vga

     In	/boot/device.hints:
     hint.vga.0.at="isa"

DESCRIPTION
     The vga driver is a generic video card driver which provides access to
     video cards.  This	driver is required for the console driver syscons(4).
     The console driver	will call the vga driver to manipulate video hardware
     (changing video modes, loading font, etc).

     The vga driver supports the standard video	cards: MDA, CGA, EGA and VGA.
     In	addition, the driver can utilize VESA BIOS extensions if the video
     card supports them.  VESA support can either be statically	included in
     the kernel	or can be loaded as a separate module.

     In	order to statically link the VESA support to the kernel, the VESA
     option (see below)	must be	defined	in the kernel configuration file.

     The vesa module can be dynamically	loaded into the	kernel using
     kldload(8).

DRIVER CONFIGURATION
   Kernel Configuration	Options
     The following kernel configuration	options	(see config(8))	can be used to
     control the vga driver.  These options provide compatibility with certain
     VGA cards.

     VGA_ALT_SEQACCESS
	    You	may want to try	this option if the mouse pointer is not	drawn
	    correctly or the font does not seem	to be loaded properly on the
	    VGA	card.  However,	it may cause flicker on	some systems.

     VGA_SLOW_IOACCESS
	    Older VGA cards may	require	this option for	proper operation.  It
	    makes the driver perform byte-wide I/O to VGA registers and	slow
	    down a little.

     VGA_WIDTH90
	    This option	enables	90 column modes: 90x25,	90x30, 90x43, 90x50,
	    90x60.  These modes	are not	always supported by the	video card and
	    the	display.  It is	highly likely that LCD display cannot work
	    with these modes.

     The following options add optional	features to the	driver.

     VESA   Add	VESA BIOS support to the driver.  If the VGA card has the VESA
	    BIOS extension 1.2 or later, this option will utilize the VESA
	    BIOS service to switch to high resolution modes.

     VESA_DEBUG=N
	    Set	the VESA support debug level to	N.  The	default	value is zero,
	    which suppresses all debugging output.

     The following options will	remove some features from the vga driver and
     save kernel memory.

     VGA_NO_FONT_LOADING
	    The	vga driver can load software font to EGA and VGA cards.	 This
	    option removes this	feature.  Note that if you use this option and
	    still wish to use the mouse	on the console then you	must also use
	    the	SC_ALT_MOUSE_IMAGE option.  See	syscons(4).

     VGA_NO_MODE_CHANGE
	    This option	prevents the driver from changing video	modes.

EXAMPLES
     Your kernel configuration should normally have:

	   device vga

     And you need the following	line in	/boot/device.hints.

	   hint.vga.0.at="isa"

     The following lines should	be included in the kernel configuration	file
     in	order to enable	the VESA BIOS Extension	support.

	   options VESA
	   device vga

     If	you do not want	VESA support included in the kernel, but want to use
     occasionally, do not add the VESA option.	And load the vesa module as
     desired:

	   kldload vesa

SEE ALSO
     vgl(3), syscons(4), config(8), kldload(8),	kldunload(8)

STANDARDS
     Video Electronics Standards Association, VESA BIOS	Extension (VBE).

HISTORY
     The vga driver first appeared in FreeBSD 3.1.

AUTHORS
     The vga driver was	written	by Soren Schmidt <sos@FreeBSD.org> and
     Kazutaka Yokota <yokota@FreeBSD.org>.  This manual	page was written by
     Kazutaka Yokota.

FreeBSD	9.3			 June 30, 1999			   FreeBSD 9.3

NAME | SYNOPSIS | DESCRIPTION | DRIVER CONFIGURATION | EXAMPLES | SEE ALSO | STANDARDS | HISTORY | AUTHORS

Want to link to this manual page? Use this URL:
<http://www.freebsd.org/cgi/man.cgi?query=vga&sektion=4&manpath=FreeBSD+7.1-RELEASE>

home | help