Bug 510029 - Display scaling causes visual artifacts for Desktop Effects (Mouse Tracker)
Summary: Display scaling causes visual artifacts for Desktop Effects (Mouse Tracker)
Status: CONFIRMED
Alias: None
Product: kwin
Classification: Plasma
Component: effects-various (other bugs)
Version First Reported In: 6.4.5
Platform: Arch Linux Linux
: NOR minor
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2025-09-28 16:09 UTC by Frederik Siefert
Modified: 2025-09-29 22:49 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Track Mouse Effect Artefacts. (214.53 KB, video/webm)
2025-09-28 16:09 UTC, Frederik Siefert 		Details
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Description Frederik Siefert 2025-09-28 16:09:10 UTC 
Created attachment 185343 [details]
Track Mouse Effect Artefacts.

SUMMARY
Using a high resolution display with a display scale higher than 100% (tested with 75, 125, 150, 200%)  introduces noticeable jitters for the Mouse Tracker Desktop Effect.

STEPS TO REPRODUCE
1. Set Display Scaling to a value other than 100%
2. Enable the Track Mouse Desktop Effect.
3. Show Track Mouse effect.

OBSERVED RESULT
The rings for the effect will stutter, lag, jump around, and partially disappear.

EXPECTED RESULT
Expected the ring animation to be fluid regardless of Display Scaling.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-arch3-1 (64-bit)
Graphics Platform: Wayland
Comment 1 Akseli Lahtinen 2025-09-29 08:58:31 UTC 
Can confirm with 125%.

Operating System: Fedora Linux 42
KDE Plasma Version: 6.5.80
KDE Frameworks Version: 6.19.0
Qt Version: 6.9.2
Kernel Version: 6.16.8-200.fc42.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 12 × AMD Ryzen 5 3600 6-Core Processor
Memory: 16 GiB of RAM (15.5 GiB usable)
Graphics Processor: AMD Radeon RX 6600