local-bin/apsalar/lockmon.sh

#!/bin/sh

bus-monitor --session "type='signal',interface='org.freedesktop.ScreenSaver'" |
  while read x; do
    case "$x" in
			# Simulate monitor being off
      *"boolean true"*) xrandr --output HDMI-0 --brightness 0.0;;
			# Restore monitor brightness
      *"boolean false"*) xrandr --output HDMI-0 --brightness 1.0;;
    esac
  done