Man page for apt-get vbetool Command
This tutorial shows the man page for man vbetool in linux.
Open terminal with 'su' access and type the command as shown below:
Result of the Command Execution shown below:
VBETOOL(1) User Commands VBETOOL(1)
vbetool run real mode video BIOS code to alter hardware state
vbetool [[vbestate save|restore]|[vbemode set|get]|[vgamode]|[dpms
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.
vbetool takes the following options:
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.
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.
vbetool will set the legacy VGA mode to the following numeric
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. This command takes
an optional argument which is the location of a file containing
a ROM image. If provided, this image will be mapped to the c000
segment and used instead of the system's video BIOS.
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
setbrightness accepts an integer as an argument and will set the
screen brightness to that
invert will invert the colours of the screen
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.
vbetool was written by Matthew Garrett
, based on
code from read edid by John Fremlin
(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)