Bug 413034

Summary: Cursor flickers/artifacts with fractional scaling on wayland
Product: [Plasma] kwin Reporter: Sawyer Bergeron <sawyerbergeron>
Component: wayland-genericAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED WORKSFORME    
Severity: normal CC: brianaberts, bugseforuns, kde, liubomirwm, meven29, poperigby, postix, rapiteanu.catalin, subdiff
Priority: NOR Keywords: wayland-only
Version First Reported In: 5.17.0   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
See Also: https://bugs.kde.org/show_bug.cgi?id=393639
https://bugs.kde.org/show_bug.cgi?id=424896
Latest Commit: Version Fixed/Implemented In:
Sentry Crash Report:

Description Sawyer Bergeron 2019-10-16 13:48:14 UTC 
SUMMARY
Cursor artifacts and flickers when fractional scaling is enabled.
Also present on 5.16.90, new since 5.16.5.

STEPS TO REPRODUCE
1. Set fractional scaling on wayland 

OBSERVED RESULT
Cursor artifacts as shown here: https://photos.app.goo.gl/cUfELqDAETymPhUG6

EXPECTED RESULT
Cursor does not artifact

SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 5.3.6-arch1-1-ARCH
(available in About System)
KDE Plasma Version: 5.17.0
KDE Frameworks Version: 5.63.0
Qt Version: 5.14.0

ADDITIONAL INFORMATION
This is experienced running on a system with an Intel iGPU, HD graphics 630 (Kaby Lake)
Comment 1 Roman Gilg 2019-10-16 14:47:15 UTC 
Similar to bug 412924
Comment 2 Sawyer Bergeron 2019-10-16 14:59:35 UTC 
(In reply to Roman Gilg from comment #1)
> Similar to bug 412924

I'm tempted to say this is a duplicate of the behavior shown there. It looks visually identical on my end. I can't reproduce it without fractional scaling, though that may be a red herring.
Comment 3 Brian 2020-07-10 20:59:22 UTC 
I experience this issue with or without fractional scaling on Wayland in Plasma 5.19.3 with QT 5.15 on Arch Linux (AMDGPU driver).

Not only does the cursor flicker, but the shadows look odd, and there is often artifacts on it.
Comment 4 Patrick Silva 2021-10-30 20:35:40 UTC 
*** Bug 438863 has been marked as a duplicate of this bug. ***
Comment 5 Nate Graham 2021-11-18 03:40:26 UTC 
*** Bug 445448 has been marked as a duplicate of this bug. ***
Comment 6 David Edmundson 2023-12-12 10:18:17 UTC 
We have made multiple changes to this area since the last report and cannot reproduce. Can you confirm if this is still an issue, ideally on Plasma 6 and reopen if a problem remains.