https://bugs.kde.org/show_bug.cgi?id=480078
Bug ID: 480078
Summary: Artifacts and tearing while dragging windows only
under 4k high refresh rate with UI global scale
Classification: Plasma
Product: kwin
Version: 5.27.10
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: eduardo.c...@kdemail.net
Target Milestone: ---
Created attachment 165059
--> https://bugs.kde.org/attachment.cgi?id=165059&action=edit
Video showing the artifacts
I got a new monitor and I started experiencing visual artifacts while dragging
windows, specially if the window being dragged overlaps with the taskbar.
The taskbar displays some flickering, and the window displays some crazy
tearing/rectangular holes. Difficult to explain in words, please see attached
video for clarification.
For me this only happens on the 4k resolution (3840x2160) AND using refresh
rates either 144Hz or 160Hz, AND using 150% scaling factor (might happen on
other scaling factor).
If I put 4k 120Hz or below, the bug doesn't trigger, it needs at least 144Hz to
trigger. If I lower the resolution to anything below 4k, it doesn't happen. If
I use 100% scaling, it doesn't happen, even on 4k 160Hz. So you need these 3
conditions to trigger it: 4k, 144Hz+, and a scaling factor like 150%.
STEPS TO REPRODUCE
1. Own a 4k+high refresh rate monitor
2. Set the resolution to 4k, the refresh rate to at least 144Hz, and the global
scaling factor to 150%.
3. Drag some window overlapping the taskbar
OBSERVED RESULT
Crazy tearing/rectangular holes on the window being dragged, and flickering on
the taskbar.
EXPECTED RESULT
Smooth dragging with no artifacts
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.27.10
KDE Frameworks Version: 5.114.0
Qt Version: 5.15.12
Kernel Version: 6.1.71-1-lts (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-8700K CPU @ 3.70GHz
Memory: 31,3 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 4090/PCIe/SSE2
nVidia driver version 535.113.01
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