Provided by: xserver-xephyr_1.11.4-0ubuntu10_amd64 bug


       Xephyr - X server outputting to a window on a pre-existing X display


       Xephyr [:display] [option ...]


       Xephyr  is  a  kdrive  server that outputs to a window on a pre-existing "host" X display.
       Think Xnest but with support for modern extensions like composite, damage and randr.

       Unlike Xnest which is an X proxy, i.e.  limited to the capabilities of the host X  server,
       Xephyr  is  a  real X server which uses the host X server window as "framebuffer" via fast
       SHM XImages.

       It also has support for "visually" debugging what the server is painting.


       The server accepts all the standard options of Xserver(1)  and  the  following  additional

       -screen widthxheight
               sets the screen size.

       -parent id
               uses  exiting  window id .  If a -screen argument follows a -parent argument, this
               screen is embedded into the given window.

               set 'cursor acceleration': The host's cursor is reused. This is only really  there
               to aid debugging by avoiding server paints for the cursor. Performance improvement
               is negligible.


       Send a SIGUSR1 to the server (e.g. pkill -USR1 Xephyr) to toggle the debugging  mode.   In
       this  mode  red rectangles are painted to screen areas getting painted before painting the
       actual content.  The delay between this can be altered by setting a XEPHYR_PAUSE  env  var
       to a value in micro seconds.


       · Rotated  displays  are  currently  updated  via full blits. This is slower than a normal
         orientated display. Debug mode will therefore not be of much use rotated.

       · The '-host-cursor' cursor is static in its appearance.

       · The build gets a warning about 'nanosleep'. I think the various  '-D'  build  flags  are
         causing  this. I haven't figured as yet how to work round it. It doesn't appear to break
         anything however.

       · Keyboard handling is basic but works.

       Mouse button 5 probably won't work.


       X(7), Xserver(1)


       Matthew Allum <> 2004