https://bugs.kde.org/show_bug.cgi?id=476342
Bug ID: 476342
Summary: After disabling laptop screen while external screen is
connected, re-enabling laptop screen causes a visual
freeze until switching to another VT and back
Classification: Plasma
Product: kwin
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Keywords: multiscreen, qt6
Severity: major
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. Use the KScreen applet to invoke "Extend to left" or "Extend to right"
modes, or use the KScreen KCM to manually mark the laptop screen as "Enabled"
OBSERVED RESULT
The laptop screen does not turn on and the external screen visually freezes.
It's not *functionally* frozen; I can still interact with screen content, but
the screen does not visually update. If I switch to a different VT and then
back, the external screen becomes unfrozen and the laptop screen has visibly
turned on. However the laptop screen remains visually frozen. In addition,
random keyboard key events appear to get eaten. I have found no pattern to
this. Rebooting brings everything back to normal.
EXPECTED RESULT
The laptop screen turns on, neither screen becomes visually frozen, no key
events get eaten.
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