It seems that there is a difference in behaviour between Xorg and Wayland session.
Xorg produces the on/off display cycling, but under Wayland the lock screen works exactly as expected. ** Description changed: System: Ubuntu Desktop 18.10 with GNOME. Fresh installation. - - Package: Unknown + Package: ubuntu-session/cosmic,cosmic,now 3.30.0-0ubuntu4 all Expected behaviour: Locking the session via Superkey+L turns connected monitors off after short period of time and puts them into sleep mode. What happens: Session gets locked, but Ubuntu seems to be unable to keep both of my monitors in sleepmode. Both monitors are blackened shortly after locking the session, displaying sort of "no signal, going to sleep", but are getting turned on a few seconds later to show the Gnome lock screen. Then they are turned off and repeating "no signal, going to sleep". This cycle repeats untill the session gets unlocked or the PC goes fully to sleep. Disabling extensions and removing all USB devices didn't change this behaviour. Previously used KDE which handled lock screens as expected. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1821237 Title: Monitors cycle on and off repeatedly when session is locked To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+bug/1821237/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
