Provided by: disper_0.3.0-1_all bug


       disper - on-the-fly display switcher


       disper [options] (-l|-s|-c|-e|-p|-i)


       Disper  re-routes  your  screen output to one or more connected displays. For example when
       giving a presentation, all one wants is that the beamer, which has just been connected, is
       able to show whatever you prepared.

       There  is the option to either clone all detected displays, or extend the desktop to them.
       Resolutions are automatically detected by default. For  cloning,  the  highest  resolution
       supported  by  all displays devices is chosen; for extending every display device gets its
       preferred or highest supported resolution. For  special  setups  requiring  more  detailed
       control, one can still use the vendor-supplied display configuration utilities.


              show program's version number and exit

       -h, --help
              show this help message and exit

       -v, --verbose
              show what's happening

       -q, --quiet
              be quiet and only show errors

       -r RESOLUTION, --resolution=RESOLUTION
              set  resolution,  e.g.  "800x600",  or  "auto"  to  detect  the display's preferred
              resolution, or "max" to use the maximum resolution advertised.  For  extend  it  is
              possible to enter a single resolution for all displays or a comma-separated list of
              resolutions (one for each display). Beware that many displays advertise resolutions
              they can not fully show, so "max" is not advised.

       -d DISPLAYS, --displays=DISPLAYS
              comma-separated  list  of displays to operate on, or "auto" to detect; the first is
              the primary display.

       -t DIRECTION, --direction=DIRECTION
              where to extend displays: "left", "right", "top", or "bottom"

              flat-panel  scaling   mode:   "default",   "native",   "scaled",   "centered",   or

              comma-separated  list  of  plugins  to  enable.  Special names: "user" for all user
              plugins in ~/.disper/hooks; "all" for all plugins found; "none" for no plugins.

              colon-separated list command-line arguments to cycle through


       Select exactly one of the following actions

       -l, --list
              list the attached displays

       -s, --single
              only enable the primary display

       -S, --secondary
              only enable the secondary display

       -c, --clone
              clone displays

       -e, --extend
              extend displays

       -p, --export
              export current settings to standard output

       -i, --import
              import current settings from standard input

       -C, --cycle
              cycle through the list of cycle stages


              Default command-line options to include at each disper invocation.  Multiple  lines
              are  concatenated,  and  lines starting with # are ignored. A typical example might
                     # enable all plugins in ~/.disper/hooks
                     # cycle over clone and extend
                     --cycle-stages='-c : -e'
              Directory containing user hooks. These can be enabled with the --plugins option.
              Directory containing system hooks. User hooks take preference of  system  hooks  or


       There  is  a possibility to cycle between different setups with a single disper invocation
       using the option --cycle. The options  to  cycle  through  are  specified  by  the  option
       --cycle-stages,  which consists of a colon-separated list of disper options. To alternate,
       for example, between clone and extend, one could use
              disper --cycle-stages='-e : -c' --cycle
       Currently the last selected stage is stored in the file  ~/.disper/last_cycle_stage.  This
       means  that  when  display  configuration  is  modified by something else than disper (for
       example by restarting the computer), cycling will continue from where it  was  last  time,
       not  necessarily from the current display configuration. This is something that may change
       in the future.


       It is possible to execute user-supplied hooks on display switch, for example to display  a
       notification or change the wallpaper. Which ones are enabled is specified by the --plugins
       option. System hooks are located in /usr/share/disper/hooks/ while user  hooks  should  be
       placed in ~/.disper/hooks/.

       Each  hook  is  an  executable  file  (which  includes scripts). The following environment
       variables are available when invoked:

              Version of disper ().

              Log level: 0 (quiet), 1 (normal) or 2 (verbose).

              Execution stage: prepare or switch. Most plugins will  only  need  to  act  on  the
              switch stage, which is just after the display switch has happened. Please make sure
              to execute an action only on switch for future compatibility. (There are ideas  for
              import and export as well.)

              Space-separated  list  of  displays  that  have output. These names may be slightly
              different  from  what  disper  uses  internally  because  they  have  to  be  valid
              environment variable names. (e.g. DFP_0 CRT_0)

              One of: clone, top, right, bottom or left.

              Size of full bounding box (e.g. 1024x768).

       For  each  of  DISPER_DISPLAYS  the resolution of the corresponding display is supplied as
       well. If only DFP-0 would be attached, DISPER_DISPLAYS would contain just  DFP_0  and  the
       following variables would be set as well:

              Resolution of display DFP-0 (e.g. 1024x768).

       If  you  want to write your own hook you can also look at the ones supplied with disper in


       Written by Willem van Engen.


       xrandr(1), nvidia-settings(1)