https://bugs.kde.org/show_bug.cgi?id=493277

--- Comment #19 from postix <pos...@posteo.eu> ---
Created attachment 174997
  --> https://bugs.kde.org/attachment.cgi?id=174997&action=edit
Full backtrace with AMD gpu and Plasma 6.2.1 and Kernel 6.11.3

Ad comment 17

dmesg
```
[12299.273568] amdgpu 0000:06:00.0: [drm] Mode Validation Warning: Unknown
Status failed validation.
[12309.482092] amdgpu 0000:06:00.0: [drm] *ERROR* [CRTC:73:crtc-0] flip_done
timed out
[12312.044146] [drm:amdgpu_dm_atomic_check [amdgpu]] *ERROR* [CRTC:73:crtc-0]
hw_done or flip_done timed out
```

journalctl
```
20:13:39 kwin_wayland_wrapper[2767]: Key repeat discarded, Wayland compositor
doesn't seem to be processing events fast enough!
20:13:39 kwin_wayland_wrapper[2767]: Key repeat discarded, Wayland compositor
doesn't seem to be processing events fast enough!
20:13:39 kwin_wayland_wrapper[2767]: Key repeat discarded, Wayland compositor
doesn't seem to be processing events fast enough!
20:13:39 kwin_wayland[2663]: Connecting to deprecated signal
QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
20:13:39 kwin_wayland_wrapper[2767]: Key repeat discarded, Wayland compositor
doesn't seem to be processing events fast enough!
(...)
20:17:01 kwin_wayland[2663]: kwin_wayland_drm: Pageflip timed out! This is a
kernel bug
20:17:07 kwin_wayland[2663]: kwin_wayland_drm: Pageflip timed out! This is a
kernel bug
20:17:12 kwin_wayland[2663]: kwin_wayland_drm: Pageflip timed out! This is a
kernel bug
20:17:17 kwin_wayland[2663]: kwin_wayland_drm: Pageflip timed out! This is a
kernel bug
20:17:22 kwin_wayland[2663]: kwin_wayland_drm: Pageflip timed out! This is a
kernel bug
(...)
```

gdb bt
```
#0  0x00007ff295f1cdb0 in __GI_ppoll (fds=fds@entry=0x55b43085d9b0,
nfds=nfds@entry=13, timeout=<optimized out>, timeout@entry=0x7ffcd3ecba30,
sigmask=sigmask@entry=0x0) at ../sysdeps/unix/sysv/linux/ppoll.c:42
#1  0x00007ff296751044 in ppoll (__fds=<optimized out>, __nfds=<optimized out>,
__timeout=<optimized out>, __ss=<optimized out>) at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/corelib/kernel/qcore_unix.cpp:100
#2  qt_ppoll (fds=0x55b43085d9b0, nfds=13, timeout_ts=0x7ffcd3ecba30) at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/corelib/kernel/qcore_unix.cpp:103
#3  qt_ppoll (fds=0x55b43085d9b0, nfds=13, timeout_ts=0x7ffcd3ecba30) at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/corelib/kernel/qcore_unix.cpp:100
#4  qt_safe_poll (fds=0x55b43085d9b0, nfds=nfds@entry=13, deadline=...) at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/corelib/kernel/qcore_unix.cpp:135
#5  0x00007ff296756c8e in QEventDispatcherUNIX::processEvents (this=<optimized
out>, flags=...) at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/corelib/tools/qarraydatapointer.h:119
#6  0x00007ff297363492 in QUnixEventDispatcherQPA::processEvents
(this=<optimized out>, flags=...) at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/gui/platform/unix/qunixeventdispatcher.cpp:27
#7  0x00007ff2965a3bc3 in QEventLoop::exec (this=this@entry=0x7ffcd3ecbc00,
flags=..., flags@entry=...) at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/corelib/global/qflags.h:34
#8  0x00007ff29659fa7c in QCoreApplication::exec () at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/corelib/global/qflags.h:74
#9  0x00007ff296dd66ed in QGuiApplication::exec () at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/gui/kernel/qguiapplication.cpp:1926
#10 0x00007ff29798b189 in QApplication::exec () at
/usr/src/debug/qt6-qtbase-6.7.2-6.fc40.x86_64/src/widgets/kernel/qapplication.cpp:2555
#11 0x000055b41387f8de in main (argc=<optimized out>, argv=<optimized out>) at
/usr/src/debug/kwin-6.2.0-2.fc40.x86_64/src/main_wayland.cpp:634
```

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