VGA(4)							   BSD 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.

BSD
								   June 30, 1999							       BSD