Running program in separate X display

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Revision as of 11:02, 3 October 2010 by Psycho zs (Talk | contribs) (Advanced script)

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It may often be handy to run some program in separate X display. I.e. 3D games for gaining performance, or making alt+tab-style switching possible with ctrl+alt+[F7-F12].

The simplest way would be:

xinit appname -- :10

Basic script

But if you have ~/.xinitrc in place, you should use full path to app to override it. Also there can be some environment variables and X options to pass. So the smart way would be to pack it all into a wrapper:

#!/bin/bash

#test if file exists, otherwise exit
which $* 2> /dev/null
if [ "$?" != "0" ] ; then
echo "No such executable"
exit 127
fi

# use this display number
NEWDISP=":10"

# this flag is used for indicating unaccessible or broken DRI.
# it is set, for example, when using fglrx+compiz-manager
# Some games will refuse to start if it is set.
# unsetting it should not do any harm, and can be useful.
unset LIBGL_ALWAYS_INDIRECT

#main execution line with automatic full path retrieval.
xinit `which $*` -- $NEWDISP -nolisten tcp -br &

#then we set useful parameters
DISPLAY=$NEWDISP
sleep 1s

# disable annoying non-linear mouse acceleration
xset m 1 0
# disable hard-coded default 10m screensaver
xset s 0 0

General principle: set variables before xinit line, and xset parameters after.

Save it as /usr/bin/xrun

After that launching app in separate X display should be as easy as typing

xrun appname

Advanced script

This script utilizes zenity to show error and info, useful for launchers and run dialogs:

#!/bin/bash

#test if file exists, otherwise exit
which $* 2> /dev/null 
if [ "$?" != "0" ] ; then
echo "No such executable!"
zenity --error --text="No such executable!" 2> /dev/null
exit 127
fi

# use this vt
LVT=`fgconsole --next-available`
#LVT=7

echo "Will launch \"$*\" on tty$LVT..."
zenity --question --title "Launch?" --text="Will launch \"$*\" on tty$LVT. Continue?" 2> /dev/null || exit 1

# use this display number
NEWDISP=":10" 

# this flag is used for indicating unaccessible or broken DRI. 
# it is set, for example, when using fglrx+compiz-manager
# Some games will refuse to start if it is set.
# unsetting it should not do any harm, and can be useful.
unset LIBGL_ALWAYS_INDIRECT

#main execution line with automatic full path retrieval.
xinit `which $*` -- $NEWDISP vt$LVT -nolisten tcp -br &

#then we set useful parameters
DISPLAY=$NEWDISP
sleep 1s

# disable non-linear mouse acceleration
xset m 1 0
# disable hard-coded default 10m screensaver
xset s 0 0

--Psycho zs 07:00, 3 October 2010 (EDT)