title: Check if display is powered on
body: <p>Is there a way to check if display is powered on in linux. I tried xrandr and xset but none of these two give me if any information about monitor power. using xrandr we can identify if the vga cable is connected but not if power is connected. I need this because many of our Lab systems keep lying unused just because some one pulls out the power cable or so.</p>
  
  <p>--
  Jatin</p>