Provided by: disper_0.3.1-2_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, "max" to use the maximum resolution advertised, or "off" to disable the
              display  entirely.  For  extend it is possible to enter a single resolution for all
              displays or a commaseparated list of resolutions (one for  each  display).   Beware
              that  many  displays advertise resolutions they can not fully show, so "max" is not

       -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  ~/.config/disper/hooks;  "all"  for  all  plugins found; "none" for no

              colon-separated list command-line arguments to cycle through; "-S:-c:-s" by default


       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


       $XDG_CONFIG_HOME/disper/config or ~/.config/disper/config or ~/.disper/config
              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 ~/.config/disper/hooks
                     # cycle over clone and extend
                     --cycle-stages='-c : -e'
       $XDG_CONFIG_HOME/disper/hooks/ or ~/.config/disper/hooks/ or ~/.disper/hooks/
              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
       $XDG_CONFIG_HOME/disper/last_cycle_stage   (actually  the  file  last_cycle_stage  in  the
       directory  of  the  last  configuration  file  read).   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 $XDG_CONFIG_HOME/disper/hooks (or ~/.config/disper/hooks/ or ~/.disper/hooks/).

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

              Version of disper (0.3.1).

              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)