SUMMARY My system hangs when making some windows fullscreen. It's happened most frequently in mpv when using VA-API but also occurred in Firefox (fullscreen mode, mouse at top to expose/hide toolbar), Gwenview, wine, and others. This has happened on all versions of 5.24 (including beta). *** NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols. See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports *** The system hangs requiring me to hit the reset button. There's nothing in journal or any other kind of log that I can see. I'll need help figuring out how to get a useful debug log. STEPS TO REPRODUCE As stated, this happens in several applications but most frequently in mpv with VA-API enabled (rarely without hwdec) so I'll use that: 1. Open a suitable video file (e.g. h264 encoded) in mpv with hwdec enabled (or press Ctrl+H to enable). Check by pressing I key and look for "(hwdec: vaapi)" in the "Video:" line. 2. Maximise window (may be optional). Press f key to enable fullscreen. OBSERVED RESULT *Sometimes* my system hangs, becoming totally unresponsive to any input and SSH sessions are terminated/timeout. No option but to hit a physical reset button. No keyboard shortcuts, e.g. 'REISUB' or Ctrl+Alt+Delete, have any effect. EXPECTED RESULT Video (or other application) should continue to play in fullscreen mode. SOFTWARE/OS VERSIONS Linux: Manjaro Linux 5.15-5.17 standard kernels, plus 5.17.7-xanmod1-2-x64v2 KDE Plasma Version: 5.23.90-5.24.5 KDE Frameworks Version: 5.91-5.93 Qt Version: 5.15.3 ADDITIONAL INFORMATION The only thing "special" about my system is it's all AMD (3700X + 6800 XT) and using a xanmod 'edge' kernel, but this also happened with standard Manjaro kernels from 5.15-5.17. However, this didn't occur with Plasma 5.23 (excluding 5.24 beta) so I'm not convinced my particular config is the reason. This also never happened on my Intel laptop. Of course, it could be that something in Kwin is exposing a bug elsewhere; this is merely a starting point as it's the only common factor I can think of.
Created attachment 148846 [details] dmesg log (from before issue has occurred) I can't get a log after this occurs but here's a dmesg log from before it, in case anything stands out.
Cannot reproduce with current git master everything, testing fullscreen MPV and vaapi decoding enabled. My system is all Intel, though.
Can't reproduce either with a rx 6800 XT and up to date Manjaro (kernel 5.16.20-2). Both git master and stable kde session handle fullscreen mpv with hardware decoding fine. A full system hang, including ssh, can pretty much only be caused by some kernel bug. Please report it to https://gitlab.freedesktop.org/drm/amd/-/issues
(In reply to Zamundaaa from comment #3) > Can't reproduce either with a rx 6800 XT and up to date Manjaro (kernel > 5.16.20-2). Both git master and stable kde session handle fullscreen mpv > with hardware decoding fine. > A full system hang, including ssh, can pretty much only be caused by some > kernel bug. Please report it to > https://gitlab.freedesktop.org/drm/amd/-/issues Thanks for trying. Looks similar to https://gitlab.freedesktop.org/drm/amd/-/issues/1973 Maybe it's specific to early RDNA2 cards as they report no problem with another card. I'll continue discussion there.