DragonFly On-Line Manual Pages

VGA(4)		      DragonFly Kernel Interfaces Manual		VGA(4)

NAME
     vga, vesa -- generic video card interface

SYNOPSIS
     options VESA
     options VESA_DEBUG=N
     options VGA_KEEP_POWERON_MODE
     options VGA_NO_FONT_LOADING
     options VGA_NO_MODE_CHANGE
     options VGA_DEBUG=N
     options VGA_WIDTH90
     device vga0 at isa? port ?

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 VGA video cards.  In addition, the
     driver can utilize the VESA BIOS Extension if the video card supports it.
     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 into 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_DEBUG=N	    Set the VGA support debug level to N.  The default
			    value is 0, which suppresses all debugging output.
			    A value of 2 gives maximum verbosity.

     VGA_KEEP_POWERON_MODE  This option keeps the initial mode's register set-
			    tings for switching back to it from another mode.

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

     VGA_NO_FONT_LOADING    This option removes font loading from the driver.
			    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.

     The following options add optional features to the driver.

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

     VESA_DEBUG=N	    Set the VESA support debug level to N.  The
			    default value is 0, which suppresses all debugging
			    output.  A value of 2 gives maximum verbosity.

EXAMPLES
     Your kernel configuration should normally have:

	   device vga0 at isa? port ?

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

	   options VESA

     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
     Apple, IBM, Motorola, "Common Hardware Reference Platform: I/O Device
     Reference", Appendix A: VGA Programming Model, p. 195,
     ftp://ftp.software.ibm.com/rs6000/technology/spec/chrp/.

     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.

DragonFly 4.3		       December 14, 2009		 DragonFly 4.3