display magic

99-displaymagic.rules

#/etc/udev/rules.d/99-displaymagic.rules
# enable LVDS on HDMI disconnect
SUBSYSTEM=="drm", ACTION=="change", RUN+="/usr/local/bin/displaymagic.sh"

displaymagic.sh

#!/bin/bash
#
# display magic v0.1.0
#
# The following script toggles between the internal monitor and an external
# monitor.
#
# by XenGi
##### edit config #####

EXTERNAL="HDMI1"
#TODO: EXTERNAL2="VGA1"
INTERNAL="LVDS1"
export DISPLAY=":0.0"
USER="bob"

#USER=$(who | grep $DISPLAY\) | head -1 | cut -f 1 -d ' ')

##### end config  #####

# Check if we are root
if [[ $EUID -ne 0 ]] ; then
    echo "This script must be run as root" 
    exit 1
fi

# check for udev rule
if [[ ! -f /etc/udev/rules.d/99-displaymagic.rules ]] ; then
    echo "No udev rule found. Put '99-displaymagic.rules' in '/etc/udev/rules.d' and execute 'udevadm control --reload' as root."
    exit
fi

# the script
export XAUTHORITY="/home/$USER/.Xauthority"

# just wait a second so that things run smooth
sleep 1

STATUS=$(su $USER -c "xrandr --current | grep $EXTERNAL | cut -d \  -f 2")
if [[ "$STATUS" == "disconnected" ]] ; then
    # switch HDMI on and LVDS off
    su $USER -c "xrandr --output $INTERNAL --off"
    su $USER -c "xrandr --output $EXTERNAL --auto"
    # set HDMI output as primary audio
    su $USER -c "pactl set-card-profile 0 output:hdmi-surround"
fi

#TODO: add the same funcionality for the VGA port.
#STATUS="`su $USER -c "xrandr --current | grep $EXTERNAL2 | cut -d \  -f 2"`"
#if [[ "$STATUS" == "disconnected" ]] ; then
#    # switch VGA on and LVDS off
#    su $USER -c "xrandr --output $INTERNAL --off"
#    su $USER -c "xrandr --output $EXTERNAL2 --auto"
#    # set internal speakers and mic as primary audio
#    su $USER -c "pactl set-card-profile 0 output:analog-stereo+input:analog-stereo"
#fi

if [[ "$STATUS" == "connected" ]] ; then
    # switch HDMI off and LVDS on
    su $USER -c "xrandr --output $EXTERNAL --off"
    su $USER -c "xrandr --output $INTERNAL --auto"
    # set internal speakers and mic as primary audio
    su $USER -c "pactl set-card-profile 0 output:analog-stereo+input:analog-stereo"
fi