https://bugs.kde.org/show_bug.cgi?id=481750
Bug ID: 481750 Summary: Periodic flicker on secondary monitor with fullscreen window on primary monitor Classification: Plasma Product: kwin Version: 5.93.0 Platform: Arch Linux OS: Linux Status: REPORTED Severity: normal Priority: NOR Component: wayland-generic Assignee: kwin-bugs-n...@kde.org Reporter: jo...@skold.cc Target Milestone: --- SUMMARY Using wayland with two monitors: - Dell AW3423DW, 3440x1440 @ 175 Hz, DisplayPort - cocopar 133LR, 1920x1080 @ 60 Hz, HDMI My GPU is an AMD RX 6900 XT, and I'm using the RADV vulkan drivers (v. 24.0.1). The AMDVLK drivers are not installed. Whenever I have a window in fullscreen on the Dell monitor, the cocopar will flicker from time to time. As in it goes black for a second or two before coming back on. Sometimes I can go several minutes without seeing the flicker, other times it happens again within seconds. It seems to happen very frequently when toggling fullscreen on or off, so that's a fast way to repro. If I force atomic modesetting off (`KWIN_DRM_NO_AMS=1`) it's a 100% repro rate whenever toggling fullscreen on or off. STEPS TO REPRODUCE 1. Have two monitors connected and configured to extend the desktop. 2. Toggle fullscreen on or off in some application on one monitor. OBSERVED RESULT The second monitor turns off and on again. EXPECTED RESULT The second monitor does not turn off. SOFTWARE/OS VERSIONS Linux/KDE Plasma: 6.7.6-zen1-1-zen / 6.0 RC2 KDE Plasma Version: 5.93.0 KDE Frameworks Version: 5.249.0 Qt Version: 6.7.0 ADDITIONAL INFORMATION - The Dell monitor never flickers, it's always the cocopar. - Toggling fullscreen on or off on the cocopar also causes it to flicker. - The same setup worked in an older version of plasma (unsure of what version, but whatever was in arch's repos a few months ago), with `KWIN_DRM_NO_AMS=1`. Unsure about without. - The same setup also works in sway, with or without atomic modesetting. -- You are receiving this mail because: You are watching all bug changes.