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vidcontrol - system console control and configuration utility



      vidcontrol - system console control and configuration utility


      vidcontrol [-CdLHPpx] [-b color] [-c appearance] [-f [size] file]
                 [-g geometry] [-h size] [-i adapter | mode] [-l screen_map]
                 [-M char] [-m on | off] [-r foreground background]
                 [-S on | off] [-s number] [-t N | off] [mode]
                 [foreground [background]] [show]


      The vidcontrol utility is used to set various options for the syscons(4)
      console driver, such as video mode, colors, cursor shape, screen output
      map, font and screen saver timeout.
      The following command line options are supported:
      mode    Select a new video mode.  The modes currently recognized are:
              80x25, 80x30, 80x43, 80x50, 80x60, 132x25, 132x30, 132x43,
              132x50, 132x60, VGA_40x25, VGA_80x25, VGA_80x30, VGA_80x50,
              VGA_80x60, VGA_90x25, VGA_90x30, VGA_90x43, VGA_90x50, VGA_90x60,
              EGA_80x25, EGA_80x43, VESA_132x25, VESA_132x43, VESA_132x50,
              VESA_132x60.  The raster text mode VESA_800x600 can also be cho‐
              sen.  Alternatively, a mode can be specified with its number by
              using a mode name of the form MODE_〈NUMBER〉.  A list of valid
              mode numbers can be obtained with the -i mode option.  See Video
              Mode Support below.
      foreground [background]
              Change colors when displaying text.  Specify the foreground color
              (e.g. “vidcontrol white”), or both a foreground and background
              colors (e.g. “vidcontrol yellow blue”).  Use the show command
              below to see available colors.
      show    See the supported colors on a given platform.
      -b color
              Set border color to color.  This option may not be always sup‐
              ported by the video driver.
      -C      Clear the history buffer.
      -c normal | blink | destructive
              Change the cursor appearance.  The cursor is either an inverting
              block (normal) that can optionally blink, or it can be like the
              old hardware cursor (destructive).  The latter is actually a sim‐
      -d      Print out current output screen map.
      -f [size] file
              Load font file for size (currently, only 8x8, 8x14 or 8x16).  The
              font file can be either uuencoded or in raw binary format.  You
              can also use the menu-driven vidfont(1) command to load the font
              of your choice.
              Size may be omitted, in this case vidcontrol will try to guess it
              from the size of font file.
              Note that older video cards, such as MDA and CGA, do not support
              software font.  See also Video Mode Support and EXAMPLES below
              and the man page for syscons(4).
      -g geometry
              Set the geometry of the text mode for the modes with selectable
              geometry.  Currently only raster modes, such as VESA_800x600,
              support this option.  See also Video Mode Support and EXAMPLES
      -h size
              Set the size of the history (scrollback) buffer to size lines.
      -i adapter
              Shows info about the current video adapter.
      -i mode
              Shows the possible video modes with the current video hardware.
      -l screen_map
              Install screen output map file from screen_map.  See also
      -L      Install default screen output map.
      -M char
              Sets the base character used to render the mouse pointer to char.
      -m on | off
              Switch the mouse pointer on or off.  Used together with the
              moused(8) daemon for text mode cut & paste functionality.
      -p      Capture the current contents of the video buffer corresponding to
              the terminal device referred to by standard input.  The
              vidcontrol utility writes contents of the video buffer to the
              standard output in a raw binary format.  For details about that
              format see Format of Video Buffer Dump below.
      -P      Same as -p, but dump contents of the video buffer in a plain text
              format ignoring nonprintable characters and information about
              text attributes.
      -H      When used with -p or -P, it instructs vidcontrol to dump full
              history buffer instead of visible portion of the video buffer
      -r foreground background
              Change reverse mode colors to foreground and background.
      -S on | off
              Turn vty switching on or off.  When vty switching is off,
              attempts to switch to a different virtual terminal will fail.
              (The default is to permit vty switching.)  This protection can be
              easily bypassed when the kernel is compiled with the DDB option.
              However, you probably should not compile the kernel debugger on a
              box which is supposed to be physically secure.
      -s number
              Set the current vty to number.
      -t N | off
              Set the screensaver timeout to N seconds, or turns it off.
      -x      Use hexadecimal digits for output.
    Video Mode Support
      Note that not all modes listed above may be supported by the video hard‐
      ware.  You can verify which mode is supported by the video hardware,
      using the -i mode option.
      The VESA BIOS support must be linked to the kernel or loaded as a KLD
      module if you wish to use VESA video modes or 132 column modes (see
      You need to compile your kernel with the VGA_WIDTH90 option if you wish
      to use VGA 90 column modes (see vga(4)).
      Video modes other than 25 and 30 line modes may require specific size of
      font.  Use -f option above to load a font file to the kernel.  If the
      required size of font has not been loaded to the kernel, vidcontrol will
      fail if the user attempts to set a new video mode.
      Modes            Font size
      25 line modes    8x16 (VGA), 8x14 (EGA)
      30 line modes    8x16
      43 line modes    8x8
      50 line modes    8x8
      60 line modes    8x8
      It is better to always load all three sizes (8x8, 8x14 and 8x16) of the
      same font.
      You may set variables in /etc/rc.conf or /etc/rc.conf.local so that
      desired font files will be automatically loaded when the system starts
      up.  See below.
      If you want to use any of the raster text modes you need to recompile
      your kernel with the SC_PIXEL_MODE option.  See syscons(4) for more
      details on this kernel option.
    Format of Video Buffer Dump
      The vidcontrol utility uses the syscons(4) CONS_SCRSHOT ioctl(2) to cap‐
      ture the current contents of the video buffer.  The vidcontrol utility
      writes version and additional information to the standard output, fol‐
      lowed by the contents of the video buffer.
      VGA video memory is typically arranged in two byte tuples, one per char‐
      acter position.  In each tuple, the first byte will be the character
      code, and the second byte is the character’s color attribute.
      The VGA color attribute byte looks like this:
      bits#                width    meaning
      7      <X0000000>    1        character blinking
      6:4    <0XXX0000>    3        background color
      3      <0000X000>    1        bright foreground color
      2:0    <00000XXX>    3        foreground color
      Here is a list of the three bit wide base colors:
            0       Black
            1       Blue
            2       Green
            3       Cyan
            4       Red
            5       Magenta
            6       Brown
            7       Light Grey
      Base colors with bit 3 (the bright foreground flag) set:
            0       Dark Grey
            1       Light Blue
            2       Light Green
            3       Light Cyan
            4       Light Red
            5       Light Magenta
            6       Yellow
            7       White
      For example, the two bytes
            65 158
      specify an uppercase A (character code 65), blinking (bit 7 set) in yel‐
      low (bits 3:0) on a blue background (bits 6:4).
      The vidcontrol output contains a small header which includes additional
      information which may be useful to utilities processing the output.
      The first 10 bytes are always arranged as follows:
            Byte Range    Contents
            1 thru 8      Literal text “SCRSHOT_”
            9             File format version number
            10            Remaining number of bytes in the header
      Subsequent bytes depend on the version number.
            Version    Byte         Meaning
            1          11           Terminal width, in characters
                       12           Terminal depth, in characters
                       13 and up    The snapshot data
      So a dump of an 80x25 screen would start (in hex)
            53 43 52 53 48 4f 54 5f 01 02 50 19
            ----------------------- -- -- -- --
                      |              |  |  |  ‘ 25 decimal
                      |              |  |  ‘--- 80 decimal
                      |              |  ‘------ 2 remaining bytes of header data
                      |              ‘--------- File format version 1
                      ‘------------------------ Literal "SCRSHOT_"
    Boot Time Configuration
      You may set the following variables in /etc/rc.conf or /etc/rc.conf.local
      in order to configure the video output at boot time.
      blanktime    Sets the timeout value for the -t option.
      font8x16, font8x14, font8x8
                   Specifies font files for the -f option.
      scrnmap      Specifies a screen output map file for the -l option.
      See rc.conf(5) for more details.
    Driver Configuration
      The video card driver may let you change default configuration options,
      such as the default font, so that you do not need to set up the options
      at boot time.  See video card driver manuals, (e.g. vga(4)) for details.


      /usr/share/syscons/fonts/*           font files.
      /usr/share/syscons/scrnmaps/*        screen output map files.


      If you want to load /usr/share/syscons/fonts/iso-8x16.fnt to the kernel,
      run vidcontrol as:
            vidcontrol -f 8x16 /usr/share/syscons/fonts/iso-8x16.fnt
      So long as the font file is in /usr/share/syscons/fonts, you may abbrevi‐
      ate the file name as iso-8x16:
            vidcontrol -f 8x16 iso-8x16
      Furthermore, you can also omit font size “8x16”:
            vidcontrol -f iso-8x16
      Moreover, the suffix specifying the font size can be also omitted; in
      this case, vidcontrol will use the size of the currently displayed font
      to construct the suffix:
            vidcontrol -f iso
      Likewise, you can also abbreviate the screen output map file name for the
      -l option if the file is found in /usr/share/syscons/scrnmaps.
            vidcontrol -l iso-8859-1_to_cp437
      The above command will load
      The following command will set-up a 100x37 raster text mode (useful for
      some LCD models):
            vidcontrol -g 100x37 VESA_800x600
      The following command will capture the contents of the first virtual ter‐
      minal video buffer, and redirect the output to the shot.scr file:
            vidcontrol -p < /dev/ttyv0 > shot.scr
      The following command will dump contents of the fourth virtual terminal
      video buffer to the standard output in the human readable format:
            vidcontrol -P < /dev/ttyv3
      kbdcontrol(1), vidfont(1), keyboard(4), screen(4), syscons(4), vga(4),
      rc.conf(5), kldload(8), moused(8), watch(8)
      The various scr2* utilities in the graphics and textproc categories of
      the Ports Collection.


      Søren Schmidt 〈〉
      Sascha Wildner


      Maxim Sobolev 〈〉, Nik Clayton 〈〉


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