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Plan 9 - man page for vga (plan9 section 8)

VGA(8)				     System Manager's Manual				   VGA(8)

NAME
       vga - configure a VGA card

SYNOPSIS
       aux/vga [ -cdilmpv ] [ mode ]

DESCRIPTION
       Aux/vga configures a VGA controller for various display sizes and depths.  Using the moni-
       tor type specified in /env/monitor (default vga) and the mode given as  argument  (default
       640x480x1),  aux/vga uses the database of known VGA controllers and monitors in /lib/vgadb
       (see vgadb(6)) to configure the display via the devices provided by vga(3).   The  options
       are:

       -c     force  the  use  of  the software cursor even if the VGA card is capable of using a
	      hardware graphics cursor.

       -d     include the color palette in whatever actions are performed, usually  printing  the
	      contents.

       -i     when used with -p display the register values that will be loaded.

       -l     load the desired mode.

       -mmonitor
	      override	the  /env/monitor  value.  /env/monitor is usually set by including it in
	      the plan9.ini file read by the PC boot program b.com(8).

       -p     print the current or expected register values at appropriate  points  depending  on
	      other options.

       -v     print a trace of the functions called.

       Mode  is  of the form XxYxZ , where X, Y, and Z are numbers specifying the display height,
       width, and depth respectively.  The mode must appear in /lib/vgadb as a value for  one  of
       the  monitor  entries.	The usual modes are 640x480x[18], 800x600x[18], 1024x768x[18][i],
       1280x1024x[18][i], 1376x1024x8, and 1600x1200x8.  A trailing indicates  interlaced  opera-
       tion.

EXAMPLES
       Change the display resolution:

	      aux/vga -l 1600x1200x8

       Print  the current VGA controller registers.  It is usually best to redirect the output of
       a -p command to a file to prevent confusion caused by using the VGA controller while  try-
       ing to dump its state:

	      aux/vga -p>/tmp/x

       Force the VGA controller to a known state:

	      aux/vga -m vga -l

       Print  the current VGA controller state and what would be loaded into it for a new resolu-
       tion, but don't do the load:

	      aux/vga -ip 1376x1024x8>/tmp/x

FILES
       /env/monitor
	      display type (default vga).

       /lib/vgadb
	      VGA configuration file.

SOURCE
       /sys/src/cmd/aux/vga

SEE ALSO
       vga(3), vgadb(6), b.com(8)

BUGS
       Aux/vga makes every effort possible to verify that the mode it is about to load	is  valid
       and  will  bail	out with an error message before setting any registers if it encounters a
       problem.  However, things can go wrong, especially when playing with a new VGA  controller
       or  monitor setting.  It is useful in such cases to have the above command for setting the
       controller to a known state at your fingertips.

											   VGA(8)


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