Difference between revisions of "Running program in separate X display"

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m (Permission problems: consolekit support was dropped, just link to General Troubleshooting#Session permissions)
(long broken script https://bbs.archlinux.org/viewtopic.php?id=214678 , not worth updating (maintain long scripts somewhere else))
 
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[[Category:X Server]]
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#REDIRECT: [[Gaming#Starting_games_in_a_separate_X_server]]
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
 
 
# calculate first available VT
 
LVT=`fgconsole --next-available`
 
 
# calculate first usable display
 
XNUM="-1"
 
SOCK="something"
 
while [ ! -z "$SOCK" ]
 
do
 
XNUM=$(( $XNUM + 1 ))
 
SOCK=$(ls -A -1 /tmp/.X11-unix | grep "X$XNUM" )
 
done
 
NEWDISP=":$XNUM"
 
 
if [ ! -z "$*" ]
 
# generate exec line if arguments are given
 
then
 
# test if executable exists
 
  if [ ! -x "$(which $1 2> /dev/null)" ]
 
then
 
echo "$1: No such executable!"
 
# if running from X, display zenity dialog:
 
[ -z "$DISPLAY" ] || zenity --error --text="$1: No such executable!" 2> /dev/null
 
exit 127
 
fi
 
# generate exec line
 
EXECL="$(which $1)"
 
shift 1
 
EXECL="$EXECL $*"
 
EXECPH=""
 
 
# prepare to start new X sessions if no arguments passed
 
else
 
EXECL=""
 
EXECPH="New X session"
 
fi
 
 
# if runing from X, display zenity dialog:
 
[ -z "$DISPLAY" ] || zenity --question --title "Launch?" --text="Will launch \"$EXECL$EXECPH\"
 
 
tty$LVT
 
X display $NEWDISP
 
 
Continue?" 2> /dev/null || exit 1
 
 
echo "Will launch \"$EXECL$EXECPH\" on tty$LVT, X display $NEWDISP..."
 
[ -z "$DISPLAY" ] && sleep 1s
 
 
 
# This flag is used for indication of 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
 
xinit $EXECL -- $NEWDISP vt$LVT -nolisten tcp -br &
 
##########################################################
 
 
# set our new dislplay
 
DISPLAY=$NEWDISP
 
# wait some time for X to load
 
sleep 4s
 
 
# then we set useful parameters
 
 
# disable non-linear mouse acceleration
 
xset m 1 0
 
 
# disable hard-coded default 10m screensaver
 
xset s 0 0
 
 
# while X is running, persistently do something useful
 
# i.e. prevent apps from enabling mouse acceleration and screensaver
 
while xset -q > /dev/null
 
do
 
xset m 1 0
 
xset s 0 0
 
sleep 3s
 
done
 
 
 
wait
 
sleep 5
 
 
 
General principle: set variables before xinit line, and xset parameters after.
 
 
Save it as /usr/bin/xrun or better as /usr/local/bin/xrun (if you have /usr/local/bin/ in your $PATH)
 
 
After that launching app in separate X display should be as easy as typing
 
xrun appname
 
 
 
'''remove lines containing zenity, if you do not have zenity installed.'''
 
 
 
 
 
 
 
== Permission problems ==
 
See [[General Troubleshooting#Session permissions]] for details.
 

Latest revision as of 12:15, 10 July 2016