https://bugs.kde.org/show_bug.cgi?id=450036
Bug ID: 450036
Summary: KWin effect animations and desktop switcher flicker
and appear pixelated instead of blurred on screen
attached to Thunderbolt dock (Wayland)
Product: kwin
Version: 5.24.0
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: philipp.reichm...@gmail.com
Target Milestone: ---
SUMMARY
KWin effects that involve blur and animated transitions flicker and appear
grainy and pixelated on a screen that is attached to a Thunderbolt 3 dock. On
the built-in screen of my laptop, they appear smooth and blurred as they
should.
It's hard to take videos or screenshots of KWin effects with Spectacle or OBS,
but a phone video showing the effect on both monitors is here:
https://youtu.be/ELo-a4dDKh0
The laptop is a Thinkpad X1 Yoga, the dock in question is a Lenovo Thunderbolt
3 dock.
The bug appears only on Wayland. It has been around for a while, it's not a
5.24 regression.
STEPS TO REPRODUCE
1. Place the mouse on the screen attached to the Thunderbolt dock
2. Invoke the virtual desktop switcher OR a KWin effect that involves animated
transitions (tested with Cover Switch and Flip Switch)
OBSERVED RESULT
Animations and transitions flicker and appear grainy and pixelated, instead of
smooth and blurred.
EXPECTED RESULT
The effects should look smooth and blurred everywhere.
SOFTWARE/OS VERSIONS
Operating System: openSUSE Tumbleweed 20220207
KDE Plasma Version: 5.24.0
KDE Frameworks Version: 5.90.0
Qt Version: 5.15.2
Kernel Version: 5.16.5-1-default (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620
ADDITIONAL INFORMATION
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