How to create a callback for “monitor plugged” on an intel graphics?

Question

I\'ve got an eeepc with an intel graphics. I\'d like to hook a script to the event of a monitor plugged via VGA. How to do that?

Answer 1

Thanks sebastianwagner!

With this information, I've been able to successfully boot my Kodi media center with the TV turned off. Indeed, when the TV is off, the Intel driver doesn't want to set up a mode and I got a blank screen when I later powered on the TV.

The Kodi log showed the following line:

WARNING: CXRandR::Query - output HDMI1 has no current mode, assuming disconnected

So I created the following line in /etc/udev/rules.d/99-monitor-hotplug.rules :

ACTION=="change", SUBSYSTEM=="drm", ENV{HOTPLUG}=="1", RUN+="/usr/sbin/hotplugtv.sh"

Content of /usr/sbin/hotplugtv.sh (my X server is running as root) :

#!/bin/bash

export DISPLAY=:0
export XAUTHORITY=/root/.Xauthority

/bin/date 2>&1 >> /var/log/hotplugtv.log;
if [[ $(cat /sys/class/drm/card0-HDMI-A-1/status | grep -Ec "^connected") -eq 1 ]]; then
        echo "TV connected!" >> /var/log/hotplugtv.log;
        /bin/sleep 2s;
        /usr/bin/xrandr --verbose --output HDMI1 --auto 2>&1 >> /var/log/hotplugtv.log;
else
        echo "TV disconnected!" >> /var/log/hotplugtv.log;
fi

Don't forget to reload udev rules when you make any change to your script (this was driving me crazy!):

udevadm control --reload-rules

Be careful to disable any screen saver in Kodi because they stay activated forever when you finally power up the TV. On the other hand energy saving / DPMS seems to work fine.