106 lines
3.1 KiB
Groff
106 lines
3.1 KiB
Groff
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.\" $RCSId: xc/programs/Xserver/hw/kdrive/vesa/Xvesa.man,v 1.5 2001/01/24 00:06:10 dawes Exp $
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.TH Xvesa 1 __vendorversion__
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.SH NAME
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Xvesa \- VESA Bios Extensions tiny X server
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.SH SYNOPSIS
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.B Xvesa
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.RI [ :display ]
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.RI [ option ...]
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.SH DESCRIPTION
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.B Xvesa
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is a generic X server for Linux on the x86 platform.
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.B Xvesa
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doesn't know about any particular hardware, and sets the video mode by
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running the video BIOS in VM86 mode.
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.B Xvesa
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can use both standard VGA BIOS modes and any modes advertised by a
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VESA BIOS if available.
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.B Xvesa
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runs untrusted code with full privileges, and is therefore a fairly
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insecure X server.
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.B Run at your own risk.
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.SH OPTIONS
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In addition to the normal KDrive server's options (see Xkdrive(1)),
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.B Xvesa
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accepts the following command line switches:
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.TP 8
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.B -mode \fIn\fB
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specifies the VESA video mode to use. If mode
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.I n
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is not supported by your BIOS and hardware,
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.B Xvesa
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will fail, hang your system, damage your hardware, or cause a global
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thermonuclear war; you are on your own. This option overrides any
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.B -screen
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options.
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.TP 8
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.B -listmodes
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list all supported video modes. If
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.B -force
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was specified before
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.BR -listmodes ,
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lists all the modes that your BIOS claims to support, even those that
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the
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.B Xvesa
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server won't be able to use.
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.TP 8
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.B -force
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disable some sanity checks and use the specified mode even if the
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BIOS claims not to support it.
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.TP 8
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.B -shadow
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use a shadow framebuffer even if it is not strictly necessary. This
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may dramatically improve performance on some hardware.
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.TP 8
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.B -nolinear
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don't use a linear framebuffer even if one is available. You don't
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want to use this option.
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.TP 8
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.B -swaprgb
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pass RGB values in the order that works on broken BIOSes. Use this if
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the colours are wrong in PseudoColor and 16 colour modes.
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.TP 8
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.B -map-holes
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use a contiguous (hole-less) memory map. This fixes a segmentation
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violation with some rare BIOSes that violate the VESA specification,
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but may cause slightly higher memory usage on systems that overcommit
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memory.
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.TP 8
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.B -force-text
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ignore saved video mode and switch back to regular 25x80 text mode
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on server exit or VT switch.
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.TP 8
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.B -verbose
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emit diagnostic messages during BIOS initialization and teardown.
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.SH KEYBOARD
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Multiple key presses recognized directly by
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.B Xvesa
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are:
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.TP 8
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.B Ctrl+Alt+Backspace
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Immediately kill the server.
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.TP 8
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.B Ctrl+Alt+F1...F12
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Switch to virtual console 1 through 12.
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.SH BUGS
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.B Xvesa
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opens all IO ports and runs your VESA BIOS, which may be assumed to be
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buggy. Allowing your users to run
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.B Xvesa
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is probably a security hole.
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.B Xvesa
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records the current BIOS mode when it starts and restores that mode on
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termination; if the video card has been reprogrammed by another application,
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the display will almost certainly be trashed. The alternative of saving and
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restoring the complete video card state has proven unreliable on most video
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cards.
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.SH SEE ALSO
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X(__miscmansuffix__), Xserver(1), Xkdrive(1), xdm(1), xinit(1).
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.SH AUTHORS
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The VESA driver was written by Juliusz Chroboczek who didn't realise
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what he was doing until it was too late. Keith Packard then added
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support for standard VGA BIOS modes and is especially proud of 320x200
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16 colour mode.
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