add hdmi_toggle.sh - simple udev hook to configure hdmi display

hdmi_toggle.sh

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+# grab the display and xauthority cookie
+export DISPLAY=$(w -h -s | grep ":[0-9]\W" | head -1 | awk '{print $2}')
+X_USER=$(w -h -s | grep ":[0-9]\W" | head -1 | awk '{print $1}')
+export XAUTHORITY=/home/$X_USER/.Xauthority
+
+# get the status of the external display
+status=$(< /sys/class/drm/card0-HDMI-A-1/status)
+case $status in
+	disconnected)
+		su $X_USER -c 'xrandr --output HDMI-1 --off'
+		logger "disabled hdmi output for $X_USER"
+		;;
+	connected)
+		while [[ $(< /sys/class/drm/card0-HDMI-A-1/enbled) ne 'enabled' ]]; do
+			su $X_USER -c 'xrandr --output HDMI-1 --auto'
+			sleep 1;
+		done
+		su $X_USER -c 'xrandr --output HDMI-1 --auto --right-of eDP-1'
+		logger "enabled hdmi output for $X_USER"
+		;;
+esac