https://bugs.kde.org/show_bug.cgi?id=500433
Bug ID: 500433
Summary: Fullscreen applications flicker if the cursor moves
between displays
Classification: Plasma
Product: kwin
Version: 6.3.1
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: d...@cosmicheron.com
Target Milestone: ---
SUMMARY
After updating to 6.3.1 whenever the mouse cursor moves between two displays
(or just touches the edge between them) while a fullscreen application (Firefox
in fullscreen, or any game, native or through Wine/Proton), the screen will
very briefly flash white. This only appears to happen on Wayland. Enabling or
disabling VRR on one or both displays doesn't seem to have any effect on this.
The only workaround I have found so far is to turn off the secondary display
when playing a game to prevent the very unpleasant flickering. This did not
happen on versions up to and including 6.3.0.
STEPS TO REPRODUCE
1. Launch Firefox and set it to fullscreen, or any game that doesn't strictly
confine the mouse cursor
2. Move the cursor into the secondary screen
3. Move the cursor back to the primary display
OBSERVED RESULT
Whenever the cursor transitions between the screen the primary display with
show a brief, bright flash.
EXPECTED RESULT
Display doesn't flicker when the cursor moves between screens when fullscreen
applications are open.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.3.1
KDE Frameworks Version: 6.11.0
Qt Version: 6.8.2
ADDITIONAL INFORMATION
Using an AMD GPU with Mesa drivers
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