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get-edid(1) [debian man page]

get-edid(1)						      General Commands Manual						       get-edid(1)

NAME
get-edid, parse-edid - read-edid tools to retrieve and interpret monitor specifications using the VESA VBE DDC protocol SYNOPSIS
get-edid | parse-edid get-edid > filename parse-edid < filename DESCRIPTION
The read-edid utility comprises two tools: get-edid and parse-edid. get-edid uses Linux's vm86(2) system call to enter virtual 8086 mode and perform Data Display Channel (DDC) transfers using the VESA BIOS Extensions (VBE) to retrieve information from monitors, including identification strings, supported sync ranges, available video modes, and video mode parameters. Such information is often useful for configuring X Window System servers such as XFree86. The data obtained by get-edid is in a binary format, so the parse-edid command is available to interpret it and generate a human-readable block of text information that can also be included in an XFree86 XF86Config file. It is customary to invoke get-edid and parse-edid together in a pipeline. get-edid and parse-edid accept no options, recognize no environment variables, read no input files, and create no output files. AUTHOR
get-edid and parse-edid were written by John Fremlin, Dan Hugo, and Martin Kavalec, using the LRMI (Linux Real-Mode Interface) library by Josh Vanderhoof. This manual page was written by Branden Robinson, originally for Debian GNU/Linux. SEE ALSO
vm86(2) John Fremlin's read-edid website <http://john.fremlin.de/programs/linux/read-edid/> at http://john.fremlin.de/programs/linux/read-edid/ Debian GNU/Linux 2002-10-03 get-edid(1)

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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 [romfile]]|[vgastate on|off]|[vbefp panelid|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 infor- mation 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", "suspend" 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 laptops), not all of this code is present after system boot - as a result, executing this command may result in undefined behaviour. 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. 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 arguments 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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