fbset - show and modify frame buffer device settings


SYNOPSIS

       fbset [options] [mode]


DESCRIPTION

       This documentation is out of date!!

       fbset  is  a system utility to show or change the settings
       of the frame buffer device. The frame buffer  device  pro­
       vides  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>, 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

              --now, -n
                     change  the  video  mode  immediately. If no
                     frame buffer device is given via -fb ,  then
                     this option is activated by default

              --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 informa­
                     tion

              --verbose, -v
                     display information what fbset is  currently
                     doing

              --version, -V
                     display the version information about fbset

                     display   the  timing  information  as  it's
                     needed by XFree86

       Frame buffer device nodes:

              -fb <device>
                     device gives the frame buffer  device  node.
                     If  no  device via -fb is given, /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 geometry:

              -xres <value>
                     set visible horizontal resolution  (in  pix­
                     els)

              -yres <value>
                     set visible vertical resolution (in pixels)

              -vxres <value>
                     set  virtual  horizontal resolution (in pix­
                     els)

              -vyres <value>
                     set virtual vertical resolution (in pixels)

              -depth <value>
                     set display depth (in bits per pixel)

              --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  vir­
                     tual resolution

       Display timings:

              -pixclock <value>
                     set  the  length  of  one pixel (in picosec­
                     onds). Note that the frame buffer device may
                     only support some pixel lengths

                     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.  -g 35242 64
                     96 35 12 112 2

       Display flags:

              -hsync {low|high}
                     set the horizontal sync polarity

              -vsync {low|high}
                     set the vertical sync polarity

              -csync {low|high}
                     set the composite sync polarity

              -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

                     played alternating, this way twice the lines
                     can be displayed and the vertical  frequency
                     for the monitor stays the same, but the vis­
                     ible 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  easily  be
                     doubled,  so that the same resolution can be
                     displayed on different monitors, even if the
                     horizontal  frequency specification 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 direction

              -step <value>
                     set step size for  display  positioning  (in
                     pixels  or  pixel  lines),  if  -step is not
                     given display will be moved 8  pixels  hori­
                     zontally 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)


AUTHORS

       Geert Uytterhoeven <Geert.Uytterhoeven@cs.kuleuven.ac.be>

       Roman Zippel <zippel@fh-brandenburg.de>
              man files


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