vbetool man page on CentOS

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VBETOOL(1)			 User Commands			    VBETOOL(1)

NAME
       vbetool - run real-mode video BIOS code to alter hardware state

SYNOPSIS
       vbetool	 [[vbestate   save|restore]|[vbemode  set|get]|[vgamode]|[dpms
       on|off|standby|suspend|reduced]|[post]|[vgastate	 on|off]|[vbefp	  pan‐
       elid|panelsize|getbrightness|setbrightness|invert]]

DESCRIPTION
       vbetool	uses lrmi in order to run code from the video BIOS. Currently,
       it is able to alter DPMS states,	 save/restore  video  card  state  and
       attempt to initialize the video card from scratch.

OPTIONS
       vbetool takes the following options:

       vbestate
	      vbetool  will  use the VESA 0x4f0f extensions to save or restore
	      hardware state. This will be sent to or read  from  stdin.  This
	      information  is  highly  hardware	 specific  - do not attempt to
	      restore state saved from a different machine. This command  will
	      not  work	 unless	 you  are  at a text console, as it interferes
	      badly with X.

       dpms   vbetool will use the VESA 0x4f10 extensions to alter  the	 power
	      management  state	 of your screen. "On", "off", "standby", "sus‐
	      pend" and "reduced" are acceptable further options and determine
	      which state will be activated.

       vbemode
	      vbetool will get or set the current VESA mode. "get" will return
	      the current mode number on stdout - "set" will set the  mode  to
	      the next argument.

       vgamode
	      vbetool  will  set  the legacy VGA mode to the following numeric
	      argument.

       post   vbetool will attempt to run BIOS code located at c000:0003. This
	      is the code run by the system BIOS at boot in order to intialise
	      the video hardware. Note that on some machines (especially  lap‐
	      tops),  not all of this code is present after system boot - as a
	      result, executing this command may result	 in  undefined	behav‐
	      iour.  This  command must be run from a text console, as it will
	      otherwise interfere with the operation of X.

       vgastate
	      vbetool will enable or disable the current video card.  On  most
	      hardware,	 disabling  will cause the hardware to stop responding
	      until it is reenabled. You probably don't want  to  do  this  if
	      you're using a framebuffer.

       vbefp  vbetool will execute a VESA flat panel interface call.

	      panelid will provide information about the panel

	      panelsize will provide the size of the panel

	      getbrightness  will  provide the current screen brightness as an
	      integer

	      setbrightness accepts an integer as an argument and will set the
	      screen brightness to that

	      invert will invert the colours of the screen

BUGS
       Switching dpms modes may interact badly with X on some systems.

       The vbestate command may behave in strange ways.

       The  post  command  may	result in the execution of arbitrary code that
       happens to be lying around in the area where chunks of your video  BIOS
       used to be.

       The VESA specification does not require that "vbemode get" provides the
       correct mode if the current mode was set via some means other than  the
       VESA BIOS extensions.

       The VESA flat panel interface ceased development at the proposal stage.
       panelid and panelsize will work on many machines, but the  other	 argu‐
       ments are unlikely to be implemented on available hardware.

AUTHOR
       vbetool	was written by Matthew Garrett <mjg59@srcf.ucam.org>, based on
       code  from  read-edid   by   John   Fremlin   <john@fremlin.de>,	  LRMI
       (http://sourceforge.net/projects/lrmi/)		  and		 XFree
       (http://www.xfree86.org). It is released under the  terms  of  the  GNU
       General Public License.

vbetool 0.2		       31 December 2004			    VBETOOL(1)
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