https://bugs.kde.org/show_bug.cgi?id=466749
Bug ID: 466749
Summary: Glitching cursor and browser content when Firefox is
in full screen using a fractional scaling factor
Classification: Plasma
Product: kwin
Version: 5.27.2
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: apri...@posteo.net
Target Milestone: ---
SUMMARY
Visual glitches in Firefox
STEPS TO REPRODUCE
1. Using KDE Plasma (Wayland) set your monitor scaling factor to a fractional
value like 150%, 195%, etc. 100% and 200% do not have this problem.
2. Open Firefox in Wayland mode with "MOZ_ENABLE_WAYLAND=1 firefox" and check
if it is actually running in Wayland mode using "qdbus org.kde.KWin /KWin
org.kde.KWin.showDebugConsole" in the terminal.
3. Open a YouTube video in full screen an let it play.
4. Move the mouse cursor slowly.
OBSERVED RESULT
When moving the mouse cursor depending on which scaling value is chosen exactly
and the monitor resolution one or both glitches occur:
1) The mouse cursor flickers, jumps or changes in size (from it's 100% scale
size to f.e. 150% and back and forth)
2) The whole window jitters left and right by a few pixels. Maybe this is
related to https://bugs.kde.org/show_bug.cgi?id=459373 where full screen
applications leave pixel gaps.
EXPECTED RESULT
When moving the mouse cursor it should stay consistently in size and the
browser content should not wiggle.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.2.1-arch1-1 (64-bit)
KDE Plasma Version: 5.27.2
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Graphics Platform: Wayland
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