for the longest time after about 5 minutes my screen would blank out. Now the screen will go blank after 5 minutes but then 2 seconds after that it will light up white and keep the laptop backlighting on. I didnt change any settings to my knowledge it just happened randomly after powering it on one day and has occurred since then.

I wish to resort back to blanking the screen out completely since i leave this computer on all the time and its hard to sleep with a huge white light all the time.

"xset dpms force off" just yeilds me ---- xset: unable to open display ""


You need to tell xset which display to use:

export DISPLAY=:0
xset q
  • 2
    > export DISPLAY=:0 > xset q after that I have ' unable to open display ":0" ' – KeyTrap Jun 12 '15 at 12:58
  • Had same problem when was trying to access monitor remotely with user other than logged in. – Nikolay Ruban Dec 11 '15 at 11:51
  • Then I get xset: unable to open display ":0" – yode Jul 2 '17 at 3:57
  • export DISPLAY=0 instead. It should work – shuva Oct 28 '18 at 15:06

Try vbetool instead xset:

sudo vbetool dpms off

It's works fine for me.

protected by Community May 25 '18 at 10:57

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