Bug 466643

Summary:	flickering blue line with scaling > 100%
Product:	[Plasma] kwin	Reporter:	Matthias Dahl <ua_bugz_kde>
Component:	wayland-generic	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED DUPLICATE
Severity:	normal	CC:	nate
Priority:	NOR
Version:	5.26.90
Target Milestone:	---
Platform:	Gentoo Packages
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:

Description Matthias Dahl 2023-03-01 08:43:14 UTC

SUMMARY
In a Plasma/Wayland session, with scaling set to anything above 100%, a flickering blue line is seen on menus between the items while moving through the items with the mouse. Also when using Midnight Commander in konsole, moving the bar around over different items, will leave line artifacts as well.

This happens with Breeze and Adwaita for example, but not with the Fusion style which, otoh, seems rather sluggish and slow.

STEPS TO REPRODUCE
1. Set scaling to anything above 100% (e.g. 150%)
2. Right click on the Plasma desktop
3. Move the mouse up and down in the menu the opened

OBSERVED RESULT
Flickering blue (full or partial) blue lines between the menu items.

EXPECTED RESULT
No flickering blue lines.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 5.26.90
KDE Frameworks Version: 5.104.0
Qt Version: 5.15.8

ADDITIONAL INFORMATION
Nvidia driver: 525.89.02
egl-gbm: 1.1.0
egl-wayland: 1.1.11-r1

Everything is compiled from yesterday's Qt-5 based git kde branches. This specific problem has been around for ages w/ the Nvidia driver at least.

Comment 1 Matthias Dahl 2023-03-01 13:44:42 UTC

1.
Just tested w/ Nvidia drivers 530.30.02, nothing has changed at all.

2.
When moving the mouse around the whole desktop while the menu is open with the blue lines, they will flicker with the movement of the mouse. If one stops moving the mouse, the flickering stops.

3.
Desktop effects seemingly have no effect on this matter whatsoever.

Comment 2 Nate Graham 2023-03-01 22:00:01 UTC


*** This bug has been marked as a duplicate of bug 465158 ***