https://bugs.kde.org/show_bug.cgi?id=472407
Bug ID: 472407 Summary: Walyand: Screencasting causes KWin to take up 100% of a single CPU core Classification: Plasma Product: kwin Version: 5.27.6 Platform: NixOS OS: Linux Status: REPORTED Severity: normal Priority: NOR Component: wayland-generic Assignee: kwin-bugs-n...@kde.org Reporter: xna...@hydra-development.net Target Milestone: --- SUMMARY The commit https://invent.kde.org/plasma/kwin/-/commit/23806d31e23d2ef2bc8344114feb6d27364cdc01 has introduced a regression that can be observed on my system that manifests itself as KWin taking up 100% of a single CPU core (and dropping frames) when screencasting. Reverting the mentioned commit has completely resolved the issue for me. STEPS TO REPRODUCE 0. Log in to Plasma Wayland session 1. Begin screencasting (I used rectangular region which is scheduled for 6.0, but fullscreen produced the same issue for me - I used OBS to test this) OBSERVED RESULT KWin takes up 100% of a singe CPU core (thread), mouse movement is choppy, and journalctl --user shows KWin is struggling with frame drops. EXPECTED RESULT Screencasting is smooth, does not impact desktop usage, and does not take 100% of a single CPU core. SOFTWARE/OS VERSIONS Linux/KDE Plasma: NixOS (available in About System) KDE Plasma Version: 5.27.6 KDE Frameworks Version: 5.106.0 Qt Version: 5.15.9 ADDITIONAL INFORMATION - -- You are receiving this mail because: You are watching all bug changes.