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: [email protected]
Reporter: [email protected]
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.
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