https://bugs.kde.org/show_bug.cgi?id=490664
Bug ID: 490664
Summary: Plasma 6 desktop sometimes freezes after connecting an
external monitor
Classification: Plasma
Product: kwin
Version: 6.1.2
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: tobiaspoto...@gmail.com
Target Milestone: ---
STEPS TO REPRODUCE
1. Connect an external monitor to my laptop while signed in into Plasma. The
screen may or may not be locked.
OBSERVED RESULT
Sometimes (maybe in 25% cases?) the desktop freezes (= becomes unresponsive).
It happens just as I connect the screen, that means immediately.
In some cases, the frozen state is only temporary and after ~10 seconds I can
resume using the system normally, in other cases the system freezes completely
and I need to hard-reset it. There is no crashing involved.
While frozen, the screen content becomes static (both on the laptop screen and
the external screen) and it does not seem to react to any input (for example,
pressing Caps Lock won't toggle the indicator light). However, unless
completely frozen, the laptop goes to sleep if I close the laptop lid (the
power diode starts slowly flashing, which is how the laptop indicates
sleeping). If I wake it up, it resumes to the frozen state.
EXPECTED RESULT
I connect an external monitor and the desktop environment is immediately
responsive.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Fedora Linux 40
KDE Plasma Version: 6.1.2
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.2
Kernel: 6.9.9-200.fc40.x86_64
Graphics Platform: Wayland
Using Lenovo Thinkpad T14s with AMD Ryzen 7 PRO 7840U.
ADDITIONAL INFORMATION
- My laptop is Lenovo Thinkpad T14s with AMD Ryzen 7 PRO 7840U.
- The monitor is a recent Thinkvision model, connected via USB-C. Not sure if
that happens also over HDMI.
- Disconnecting the external screen works fine. Also once the external screen
is successfully connected, I works reliably (no issues of this kind).
- This behavior started with Plasma 6. It was fine in Plasma 5 (also Wayland).
I did not report it earlier as I considered to be an early Plasma 6 issue to be
ironed out soon, but unfortunately it persists even with Plasma 6.1.
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