Display switch script.

conf_external_display.sh

#!/bin/bash

#
# A tinny script based on:
# http://hoyhabloyo.wordpress.com/2012/01/18/xfce-display-switching-dual-single-monitor/
# to configure automatically an external display.
#
{

  INT_DISPLAY='LVDS1';
  EXT_DISPLAY='VGA1';
  EXT_DISPLAY_STATUS=`cat /sys/class/drm/card0-VGA-1/status`;

  function activate_external() {
    xrandr --output "$INT_DISPLAY" --off
    xrandr --output "$EXT_DISPLAY" --auto
  }

  function deactivate_external() {
    xrandr --output "$EXT_DISPLAY" --off
    xrandr --output "$INT_DISPLAY" --auto
  }

  # Main
  {

    if [ "$EXT_DISPLAY_STATUS" == "connected" ]; then {
      activate_external;
    } else {
      deactivate_external;
    } fi;

    exit 0

  }

}