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.
