https://bugs.kde.org/show_bug.cgi?id=512155
--- Comment #2 from Jackson <[email protected]> --- I figured out how to consistently reproduce the bug every time. STEPS TO REPRODUCE 1. Confirm Display Configuration is set to "Switch to external screen" when connected to an external monitor. 2. Wake and then sleep the laptop while *not* connected to the external monitor. 3. Connect the laptop to the external monitor and turn the monitor on. 4. Wake the laptop and log in.[1] 5. Turn off the monitor or disconnect the laptop. OBSERVED RESULT The laptop's built-in screen does not turn on. Even after sleeping and waking it again, the screen will never turn on and the issue is only resolved by a hard restart. EXPECTED RESULT The laptop's built-in screen should turn on. ADDITIONAL INFORMATION My issue before was that sleeping the laptop while connected to the monitor does not trigger the problem so it seemed inconsistent to me. I have also tested this with an X11 session. The bug never occurs with X11: the laptop's screen always turns on as it should. It is, therefore, some issue with Wayland. In addition, the bug still occurs if the login screen is not set to show after waking from sleep. I did, at least, discover a sort of workaround. Always wake the laptop *before* connecting it to the external monitor. Then, once the monitor is turned on and plugged in, it will switch properly. If the monitor is first turned on as the laptop wakes, then the bug will appear when the laptop is disconnected again and won't resolve until a reboot. [1] Often the login screen at this point shows a sign that there is something wrong, namely the circle around the user avatar is missing and the avatar is square; unsure if that is relevant. -- You are receiving this mail because: You are watching all bug changes.
