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fbset(1) Linux frame buffer utils fbset(1)
NAME
fbset - show and modify frame buffer device settings
SYNOPSIS
fbset [options] [mode]
DESCRIPTION
fbset is a system utility to show or change the settings of the frame buffer device. The
frame buffer device provides a simple and unique interface to access different kinds of
graphic displays.
Frame buffer devices are accessed via special device nodes located in the /dev directory.
The naming scheme for these nodes is always fb/<n> or fb<n>, where n is the number of the
used frame buffer device.
fbset uses an own video mode database located in /etc/fb.modes. An unlimited number of
video modes can be defined in this database. For further information see fb.modes(5).
OPTIONS
If no option is given, fbset will display the current frame buffer settings.
General options:
--help, -h
display an usage information
--test don't change, just test whether the mode is valid
--show, -s
display the video mode settings. This is default if no further option or
only a frame buffer device via -fb is given
--info, -i
display all available frame buffer information
--verbose, -v
display information what fbset is currently doing
--version, -V
display the version information about fbset
--xfree86, -x
display the timing information as it's needed by XFree86
Frame buffer device nodes:
--all, -a
change all virtual consoles on this device
-fb <device>
device gives the frame buffer device node. If no device via -fb is given,
/dev/fb/0 or /dev/fb0 is used
Video mode database:
-db <file>
set an alternative video mode database file (default is /etc/fb.modes), see
also fb.modes(5)
Display bitfield colors:
-rgba <red,green,blue,alpha>
each in length or length/offset color format
Display geometry:
-xres <value>
set visible horizontal resolution (in pixels)
-yres <value>
set visible vertical resolution (in pixels)
-vxres <value>
set virtual horizontal resolution (in pixels)
-vyres <value>
set virtual vertical resolution (in pixels)
-depth <value>
set display depth (in bits per pixel)
-nonstd <value>
select nonstandard video mode
--geometry, -g ...
set all geometry parameters at once in the order <xres> <yres>
<vxres> <vyres> <depth>, e.g. -g 640 400 640 400 4
-match
make the physical resolution match the virtual resolution
Display timings:
-pixclock <value>
set the length of one pixel (in picoseconds). Note that the
frame buffer device may only support some pixel lengths
-left <value>
set left margin (in pixels)
-right <value>
set right margin (in pixels)
-upper <value>
set upper margin (in pixel lines)
-lower <value>
set lower margin (in pixel lines)
-hslen <value>
set horizontal sync length (in pixels)
-vslen <value>
set vertical sync length (in pixel lines)
--timings, -t ...
set all timing parameters at once in the order <pixclock>
<left> <right> <upper> <lower> <hslen> <vslen>, e.g. -t 35242
64 96 35 12 112 2
Display flags:
-accel {false|true}
set hardware text acceleration enable
-hsync {low|high}
set the horizontal sync polarity
-vsync {low|high}
set the vertical sync polarity
-csync {low|high}
set the composite sync polarity
-gsync {false|true}
set synch on green
-extsync {false|true}
enable or disable external resync. If enabled the sync timings
are not generated by the frame buffer device and must be pro-
vided externally instead. Note that this option may not be
supported by every frame buffer device
-bcast {false|true}
enable or disable broadcast modes. If enabled the frame buffer
generates the exact timings for several broadcast modes (e.g.
PAL or NTSC). Note that this option may not be supported by
every frame buffer device
-laced {false|true}
enable or disable interlace. If enabled the display will be
split in two frames, each frame contains only even and odd
lines respectively. These two frames will be displayed alter-
nating, this way twice the lines can be displayed and the ver-
tical frequency for the monitor stays the same, but the visi-
ble vertical frequency gets halved
-double {false|true}
enable or disable doublescan. If enabled every line will be
displayed twice and this way the horizontal frequency can eas-
ily be doubled, so that the same resolution can be displayed
on different monitors, even if the horizontal frequency speci-
fication differs. Note that this option may not be supported
by every frame buffer device
Display positioning:
-move {left|right|up|down}
move the visible part of the display in the specified direc-
tion
-step <value>
set step size for display positioning (in pixels or pixel
lines), if -step is not given display will be moved 8 pixels
horizontally or 2 pixel lines vertically
EXAMPLE
To set the used video mode for X insert the following in rc.local:
fbset -fb /dev/fb0 vga
and make the used frame buffer device known to X:
export FRAMEBUFFER=/dev/fb0
FILES
/dev/fb*
/etc/fb.modes
SEE ALSO
fb.modes(5), fbdev(4), /usr/share/doc/fbset/FAQ
AUTHORS
Geert Uytterhoeven <Geert.Uytterhoeven AT cs.be>
Roman Zippel <zippel AT fh-brandenburg.de>
man files
2.1 2006-01-18 fbset(1)
Generated by $Id: phpMan.php,v 4.49 2006/02/26 13:18:18 chedong Exp $ Author: Che Dong
On Apache
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2012-05-25 21:15 @38.107.179.240 Crawled by CCBot/1.0 (+http://www.commoncrawl.org/bot.html)