https://bugs.kde.org/show_bug.cgi?id=476340
Bug ID: 476340 Summary: When disabling the laptop screen while an external screen is connecting, disconnecting the external screen doesn't re-activate the laptop screen Classification: Plasma Product: kwin Version: master Platform: Other OS: Linux Status: REPORTED Keywords: qt6 Severity: grave Priority: NOR Component: multi-screen Assignee: kwin-bugs-n...@kde.org Reporter: n...@kde.org Target Milestone: --- Plasma 6 Wayland, today's git master. GPU hardware is an Intel 10th gen iGPU; drivers are from Mesa 23.1.9. STEPS TO REPRODUCE 1. Have a laptop (it has a 4k screen normally run at 200% scale) 2. Plug in an external HDMI screen, either directly, or via a DisplayPort dongle (doesn't seem to make a difference) 3. Use the KScreen applet to invoke "Switch to External Screen" mode. The laptop screen correctly turns off. 4. Unplug the external screen OBSERVED RESULT The laptop screen does not turn back on. This is 100% reproducible for me. EXPECTED RESULT It *does* turn back on. ADDITIONAL INFORMATION If I plug in the external screen again, it comes back as expected. If I use the KScreen applet to invoke "Extend to left" or "Extend to right" modes, or if I use the KScreen KCM to manually mark the laptop screen as "Enabled", then it turns on, but it's lost its Plasma containment. All I see on it is the banner in the corner, and right-clicking on the black desktop does nothing. Restarting plasmashell or switching with display is marked as "Primary" does not fix the issue. Probably a separate issue for which I will submit a different bug report. Regardless, it is not clear how to make the laptop display work again. For this reason, I'm marking the bug as Grave. -- You are receiving this mail because: You are watching all bug changes.