acpi_monitor.sh

#!/bin/sh

acpi_listen | while IFS= read line
do
    if [ "$line" == "jack/headphone HEADPHONE plug" ]; then
        echo "Headphone plugged, muting HDMI output..."
        amixer -c 0 -d 3 set Master mute
    elif [ "$line" == "jack/headphone HEADPHONE unplug" ]; then
        echo "Headphone unplugged, turning HDMI output on..."
        amixer -c 0 -d 3 set Master unmute
    elif [ "$line" == "jack/lineout LINEOUT plug" ]; then
        echo "HDMI output plugged, muting jack output..."
        amixer -c 0 -d 0 set Master mute   
    elif [ "$line" == "jack/lineout LINEOUT unplug" ]; then
        echo "HDMI output unplugged, turning headphone output on..."
        amixer -c 0 -d 0 set Master unmute
    fi
done