Hi Alex,
the problem is, also root hasn't the rights to use a x-server owned by
an other user. You can force root to use an other users xauthority by
setting the environment variable to the users xauthority data:
export XAUTHORITY=/home/.../.Xauthority
Here is my hack to use the external monitor if the VGA is plugged in:
/etc/udev/rules.d/70-external-monitor.rules:
# VGA changed
KERNEL=="card0", ACTION=="change", RUN+="/usr/local/scripts/external-monitor.sh"
/usr/local/scripts/external-monitor.sh:
#!/bin/sh
status="$(cat /sys/class/drm/card0-VGA-1/status)"
export XAUTHORITY=/home/marius/.Xauthority
export DISPLAY=:0.0
if [ "${status}" = disconnected ]
then
xrandr --output LVDS1 --auto --output VGA1 --off
elif [ "${status}" = connected ]
then
xrandr --output LVDS1 --off --output VGA1 --auto
fi
--
udev scripts running as root cannot use xrandr
https://bugs.launchpad.net/bugs/660901
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