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fbset (8)
  • >> fbset (8) ( Linux man: Команды системного администрирования )
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    NAME

    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    This documentation is out of date!!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 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>, 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 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:

    -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 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)
    --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. -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 provided 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 alternating, this way twice the lines can be displayed and the vertical frequency for the monitor stays the same, but the visible 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 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)  

    AUTHORS

    Geert Uytterhoeven <[email protected]>
    Roman Zippel <[email protected]>

    man files


     

    Index

    NAME
    SYNOPSIS
    DESCRIPTION
    OPTIONS
    EXAMPLE
    FILES
    SEE ALSO
    AUTHORS


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