I have 16.04 LTS on a Dell XPS13 (L321X) and an external LG display connected.

I set it up to: -dim the screen -turn screen off when inactive for 10 minutes -lock ON -lock screen as soon as screen turns off -require password when waking from suspend

Problem is that after 10 minutes, both displays get turned off but right after come back on showing the lockscreen. They don't stay off.

This is a fresh 16.04 install.

With my previous installed version, 12.04, this did not happen.

Any known bugs that I may be hitting?


  • I'm having the same issue. Fortunately, my LG 27UK650_600 is staying off, but the login screen is burning a hole in my Laptop monitor. – Lonnie Best May 26 '18 at 7:37

I found out there was a bug related to this unexpected behavior. Bug #1292041.

This got fixed recently with the release of a Unity patch. See https://bugs.launchpad.net/ubuntu/+source/gnome-screensaver/+bug/1292041

After updating the OS, it now works well on my setup, the monitors blank off, and stay that way until I hit a key or move the mouse.

  • Probably right. I am the one who posted the question AND the answer in first place. I found out that there WAS a bug I was hitting, should've mentioned in the answer. Will edit. – tux1c Jul 14 '16 at 13:21
  • Links to bug reports aren't considered answers on AU (see also How do I write a good answer? for general advice about what sorts of answers are considered most valuable on Ask Ubuntu.). But I see you added the instructions that led to a solution. +1 – David Foerster Jul 14 '16 at 19:34
  • This isn't fixed anymore in 16.04.4. Login screen wakes up monitor and stays on. – Lonnie Best May 26 '18 at 8:06
  • This isn't fixed in Ubuntu 16.04.5 either. After the screen goes off, screen lock wakes it back up and it stays on forever. – Lonnie Best Mar 10 '19 at 16:41
  • This is a problem in 19.04 still (or again). – Enigma Jul 9 '19 at 4:20

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