Bug 483388

Summary:	Parts of some QtWidgets apps are black and flickering with NVIDIA GPU
Product:	[Plasma] kwin	Reporter:	Lorenz Hoffmann <hoffmann_lorenz>
Component:	general	Assignee:	KWin default assignee <kwin-bugs-null>
Status:	RESOLVED WORKSFORME
Severity:	normal	CC:	nate
Priority:	NOR	Keywords:	qt6
Version First Reported In:	6.0.2
Target Milestone:	---
Platform:	Arch Linux
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:
Sentry Crash Report:

Description Lorenz Hoffmann 2024-03-12 22:04:37 UTC

SUMMARY
***
NOTE: If you are reporting a crash, please try to attach a backtrace with debug symbols.
See https://community.kde.org/Guidelines_and_HOWTOs/Debugging/How_to_create_useful_crash_reports
***

Some time after starting the application, widgets start to flicker. They flicker between completely black and the normal, expected view. This resolves itself after some time, and later appears again. I only notice this in KSystemLog (for now).

STEPS TO REPRODUCE
1. Start the app
2. Wait a few seconds

OBSERVED RESULT
Widgets flicker between being completely black and normal.

EXPECTED RESULT
...they should not flicker.

SOFTWARE/OS VERSIONS
Operating System: Arch Linux 
KDE Plasma Version: 6.0.1
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.9-zen1-1-zen (64-bit)
Graphics Platform: Wayland
Processors: 12 × Intel® Core™ i5-10400F CPU @ 2.90GHz
Memory: 15.5 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 2080/PCIe/SSE2

ADDITIONAL INFORMATION
KSystemLog is installed from the arch repo.

Comment 1 Lorenz Hoffmann 2024-03-12 22:06:37 UTC

Hovering the mouse over some widgets can sometimes fix it. Thats why I think its the widgets flickering, not the whole window. Menubar and application bar at the top are not affected.

Comment 2 Lorenz Hoffmann 2024-03-13 08:17:44 UTC

This just happened with VLC as well, so it's not the app. My next guess is KWin?

Comment 3 Lorenz Hoffmann 2024-09-24 18:15:32 UTC

Haven't noticed this anymore for a long time.