Bug 482351

Summary:	Glitch/artifact on screen edge with fractional scaling on Wayland
Product:	[Plasma] kwin	Reporter:	Xiaoyan Ren <xy.r>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	fanzhuyifan
Priority:	NOR	Keywords:	qt6
Version First Reported In:	6.0.0
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Xiaoyan Ren 2024-03-04 01:22:43 UTC

SUMMARY
On Wayland, if you apply fractional scaling by a percentage that does not fully divide the screen resolution, then there will be 1px of artifact on the right/bottom edges of the screen.

STEPS TO REPRODUCE
E.g. I have an 2560x1600 monitor.
1. Open Display Settings.
2. Choose a fractional scaling percentage that doesn't fully divide the resolution, i.e. 150% in my case.
3. Move windows around on the desktop.

OBSERVED RESULT
Observe that there is 1px of artifact on the bottom and right screen edge. It's typically patterns from the wallpaper, but occasionally some windows' details make it there as well.

EXPECTED RESULT
There is no artifact on the screen edge.

SOFTWARE/OS VERSIONS
Linux: Arch Linux
Kernel Version: 6.7.8-zen1-1-zen
KDE Plasma Version: 6.0.0
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Graphics: Intel Iris Xe
Driver: kernel modesetting

ADDITIONAL INFORMATION
Screenshot for reference: https://snipboard.io/0B9kIc.jpg

Comment 1 fanzhuyifan 2024-03-04 03:06:31 UTC


*** This bug has been marked as a duplicate of bug 480171 ***