It's possible you have some saved configs involving two monitors rather than the three that are connected. If any of those old configs involved disabling the laptop screen then they might be used briefly while the third monitor wakes up.
Try: (a) Without any external monitors connected; and (b) After deleting ~/.config/monitors.xml and logging in again. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2120744 Title: Screen turn off while wakingup from sleep To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/2120744/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
