Created attachment 149030 [details] Stack trace produced by following these instructions: https://community.kde.org/KWin/Debugging#TL.3BDR_for_bug_reporters SUMMARY KWin often crashes when monitors wake up from sleep. GDB stacktrace says the crash is in KWin::Workspace::clientArea: Thread 1 "kwin_x11" received signal SIGSEGV, Segmentation fault. KWin::Workspace::clientArea (this=0x563633dfaaf0, opt=KWin::PlacementArea, output=<optimized out>, desktop=<optimized out>) at /usr/src/debug/kwin-5.24.4-1.fc35.x86_64/src/workspace.cpp:2288 2288 screenArea = effectiveOutput->geometry(); STEPS TO REPRODUCE 1. Lock the screen 2. Power off both monitors / let monitors go to sleep 3. Power on both monitors / wake monitors up Repro is inconsistent. Seems to happen most consistently after a fresh reboot. OBSERVED RESULT System journal indicates that kwin crashed. Desktop shows various kinds of corruption: flashing or black background, occasionally missing panels. EXPECTED RESULT Crash doesn't happen. SOFTWARE/OS VERSIONS Linux/KDE Plasma: Fedora 35 (available in About System) KDE Plasma Version: 5.24.4 KDE Frameworks Version: 5.91.0 Qt Version: 5.15.2 ADDITIONAL INFORMATION If I remember correctly, this crash started happening when I bought a new monitor, changing my display arrangement to a 2560x1440 primary monitor and a portrait mode 1920x1080 monitor on the left side. The crash seems to be related to the primary monitor waking up, judging by observing journal output when waking up the monitors.
Created attachment 149031 [details] journal output at the time of the crash
Created attachment 149032 [details] Screenshot of display arrangment within systemsettings Kernel version is 5.17.7-200.fc35.x86_64 I think it might have something to do with my display arrangment. I'm attaching a screenshot to demonstrate it.
*** This bug has been marked as a duplicate of bug 448102 ***