Bug 483067

Summary: Fractional scaling causes unwanted mouse acceleration in games
Product: [Plasma] kwin Reporter: pete <hayyash>
Component: inputAssignee: KWin default assignee <kwin-bugs-null>
Status: REPORTED ---    
Severity: normal CC: hayyash, nate
Priority: NOR Keywords: qt6
Version: 6.0.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:

Description pete 2024-03-10 03:55:46 UTC 
SUMMARY
***
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***


STEPS TO REPRODUCE
1. Set monitor scaling to 125%. Turn off pointer acceleration in plasma settings.
2. Load CS2 or another FPS game
3. Test for mouse acceleration. I used this method: https://www.youtube.com/watch?v=5Cy8G2ElLOk

OBSERVED RESULT
pointer does not return to starting location with different mouse movement speeds. Significant mouse acceleration is present unless monitor is set to 100% scaling.

EXPECTED RESULT
pointer should not exhibit acceleration when using scaling.

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Arch Linux
(available in About System)
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2

ADDITIONAL INFORMATION