Summary: My external monitor is disabled after power save turns screens off, changing the multiple screens setup, and remains disabled until I press a button on the monitor.

I have a monitor connected to my laptop via DisplayPort. Whenever the power save settings lock the screen, both the monitor and laptop screen enter power save mode, as would be expected.

However, right after this happens, the monitor is disabled, and the screen setup changes to use only the laptop screen ( the laptop screen switches on, and its resolution changes before being turned off again after a few seconds, as it is in power save mode).

Then, when I move my mouse or press a key, only the laptop screen is switched on and enabled, while the monitor remains in power save mode. It is only enabled again if I press a button on the monitor itself.

Ubuntu knows perfectly that it is there, because it shows in gnome "screens" settings, and I can enable it back there again ( although I lose the resolutions and position preferences if I do that).

This would be just a minor inconvenience if it wasn't because whenever this happens, all window positions in the monitor are rearranged.

If I use VGA with the same monitor, it doesn't happen (but then I can't use its native 2560x1440 resolution).

This also occurs when booting from a LiveUSB of Ubuntu 18.04 LTS.

  • So, no one can help With this? I am interested in filinga bug report to launchpad, but I wouldn't know what program/package to file it against. – Chikitulfo May 28 at 9:31
  • I too suffer from a version of this, only I've got a desktop and a single screen. The problem seems very hardware dependent, but you could try xset -display :n dpms force on (where :n is the X display number)? Doesn't actually work for me though, so not putting this as an answer. – TommyPeanuts May 28 at 21:19
  • I tried that already, as I saw it in other questions. It doesn't work – Chikitulfo May 29 at 14:50

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