https://bugs.kde.org/show_bug.cgi?id=509439

            Bug ID: 509439
           Summary: After suspending the computer with an external display
                    attached, the kwin_wayland process crashed.
    Classification: Plasma
           Product: kwin
      Version First 6.4.4
       Reported In:
          Platform: Other
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: wayland-generic
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 184921
  --> https://bugs.kde.org/attachment.cgi?id=184921&action=edit
"journalctl -b | grep kwin" output

SUMMARY
After suspending the computer with an external display attached, the
kwin_wayland process crashed.

OBSERVED RESULT
When waking up the computer from sleep, the login screen briefly appears before
switching to a black, terminal-like screen. I am able to type into this screen,
but the system does not respond to any input. I can access tty, but it is not
possible to interact with plasma in a functional way. If I execute "killall -9
kwin_wayland" from the tty, I am then returned to the login screen and
everything operates as normal, except I am unable to access tty again after
this step.

The bug is highly reproducible. It appears only when using Wayland with an
additional display attached through the HDMI port. This happens if I put the
computer into suspend manually, as well as if I leave it to suspend itself over
time. When using the built-in screen only or when using X11, the computer wakes
from sleep normally with no issue. "nvidia-smi" works correctly as well.

I have been using the same hardware configuration for months with no issues.
The bug appeared after the last update - maybe OS related.

Operating System: TUXEDO OS 
KDE Plasma Version: 6.4.4
KDE Frameworks Version: 6.17.0
Qt Version: 6.8.2
Kernel Version: 6.14.0-110029-tuxedo (64-bit)
Graphics Platform: Wayland
Processors: 16 × AMD Ryzen 7 8845HS w/ Radeon 780M Graphics
Memory: 32 GiB of RAM (30.6 GiB usable)
Graphics Processor 1: AMD Radeon Graphics
Graphics Processor 2: llvmpipe

GPU: NVIDIA GeForce 4060 mobile
Driver: 570.153.02
CUDA: 12.8

ADDITIONAL INFORMATION
For output of "journalctl -b | grep kwin" see attachment

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