https://bugs.kde.org/show_bug.cgi?id=493778
Bug ID: 493778
Summary: kwin deadlock on disconnect/reconnect external monitor
Classification: Plasma
Product: kwin
Version: 6.1.90
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: critical
Priority: NOR
Component: multi-screen
Assignee: kwin-bugs-n...@kde.org
Reporter: ike.devol...@archlinux.org
Target Milestone: ---
SUMMARY
It is not 100% on reconnect, but usually disconnecting an external diplay works
fine and reconnecting sends kwin_wayland to ~100% cpu on a laptop with
intel/nvidia (iris/nouveau). This is visible in a way that you can see the
interface, but no mouse input works, no keyboard input works, you can't even
seem to switch to VT as well.
STEPS TO REPRODUCE
1. log in, have laptop internal monitor as secondary and external display as
primary, all open windows are on external display
2. disconnect external display (usually in my case this works) (what I have
noticed is that evolution is not showing up on my laptop display and that that
window if you click in the task manager looks like it is still on another
display, while that is not there)
3. reconnect external display -> nothing shows up there, get a "no signal" and
if I ssh into the machine kwin_wayland is doing ~100% cpu
OBSERVED RESULT
You think the system hangs, no input is possible, no mouse, nothing
I have observed this with kwin 6.1.5-1, so I installed KDE-Unstable to see if
it was also the case there
With kwin 6.1.90 I have installed what I think the relevant -debug packages and
attached gdb which resulted in these stacks: https://pastebin.com/5YiaBj6Y
EXPECTED RESULT
keep working and move all my open windows to the correct display
SOFTWARE/OS VERSIONS
Windows:
macOS:
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma:
KDE Plasma Version: 6.1.90
KDE Frameworks Version: 6.6.0
Qt Version: 6.8.0rc1
ADDITIONAL INFORMATION
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