#!/bin/bash

hdmi_state=''

while true;
do
        xrandr_output=`DISPLAY=:0 xrandr`

        if [[ $xrandr_output == *"HDMI1 disconnected"* ]];
        then
                if [[ $hdmi_state == 'connected' ]];
                then
                        echo hdmi disconnected
                fi

                hdmi_state='disconnected'
        else
                if [[ $hdmi_state == 'disconnected' ]];
                then
                        DISPLAY=:0 xrandr --output HDMI1 --auto
                        sleep 1
                        sudo killall xfce4-display-settings
                        echo hdmi connected
                fi

                hdmi_state='connected'
        fi
done