Bug 496881

Summary:	Panel artifact (dark rectangle) is present when no window is maximized
Product:	[Plasma] plasmashell	Reporter:	djmenig
Component:	Panel	Assignee:	Plasma Bugs List <plasma-bugs-null>
Status:	RESOLVED FIXED
Severity:	minor	CC:	nate, niccolo.venerandi
Priority:	NOR
Version First Reported In:	master
Target Milestone:	1.0
Platform:	openSUSE
OS:	Linux
Latest Commit:		Version Fixed/Implemented In:	6.4.0
Sentry Crash Report:
Attachments:	Artifact shown with Breeze theme Artifact shown with Breeze Dark theme

Description djmenig 2024-11-30 22:14:07 UTC

SUMMARY
There is a dark rectangle that is about 40% of the panel's height that spans about 90% of the panel's width. This rectangle is disappears when a window is maximized, and is persistent when no windows are maximized. It is present in both 'Breeze' and 'Breeze Dark' (see screenshots). 

STEPS TO REPRODUCE
1. Boot up latest Plasma release.
2. Observe panel in its default state, and notice the artifact mentioned.
3. Launch a window, maximize it, and notice the artifact is no longer present.

OBSERVED RESULT
An unintentional artifact is present on the panel.

EXPECTED RESULT
The artifact should not be there.

SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.2.80
KDE Frameworks Version: 6.9.0
Qt Version: 6.8.0
Kernel Version: 6.11.8-1-default (64-bit)
Graphics Platform: Wayland
Processors: 22 × Intel® Core™ Ultra 7 155H
Memory: 15.1 GiB of RAM
Graphics Processor: Intel® Arc
Manufacturer: Dell Inc.
Product Name: Inspiron 16 7640 2-in-1

Comment 1 djmenig 2024-11-30 22:16:08 UTC

Created attachment 176250 [details]
Artifact shown with Breeze theme

Comment 2 djmenig 2024-11-30 22:16:38 UTC

Created attachment 176251 [details]
Artifact shown with Breeze Dark theme

Comment 3 djmenig 2024-12-01 02:13:52 UTC

The rectangular artifact as disappears when a window is touching the panel. Without looking at the code, I would guess that it has something to do with translucency.

Comment 4 Nate Graham 2024-12-13 18:10:14 UTC

I suspect a GPU driver glitch here. Never been able to reproduce it myself with an Intel HD620 iGPU or Radeon 780M iGPU.

Comment 5 djmenig 2024-12-22 17:39:16 UTC

(In reply to Nate Graham from comment #4)
> I suspect a GPU driver glitch here. Never been able to reproduce it myself
> with an Intel HD620 iGPU or Radeon 780M iGPU.

It very well could be a GPU driver; however, I played around with some different display configurations and it seems as though the issue is only present with display scaling set at 150%. Is the issue reproducible with display scaling set at 150%?

Comment 6 Nate Graham 2025-01-02 18:58:29 UTC

I use an AMD GPU now, but no, I can't experience the issue with any scale factor.

Comment 7 Nate Graham 2025-05-07 20:49:19 UTC

Since then, I've seen this from time to time, but unfortunately never managed to figure out a pattern.

However I haven't seen in in a month or two on git master with Fedora 42; perhaps it's fixed now. Let's call it fixed until someone can reproduce it in Plasma 6.4 or later.

Comment 8 djmenig 2025-05-08 04:51:38 UTC

(In reply to Nate Graham from comment #7)
> Since then, I've seen this from time to time, but unfortunately never
> managed to figure out a pattern.
> 
> However I haven't seen in in a month or two on git master with Fedora 42;
> perhaps it's fixed now. Let's call it fixed until someone can reproduce it
> in Plasma 6.4 or later.

Understood. Unfortunately, it persists on my system. I'll have a look to see what kind of support I can drum up on socials and forums. If I receive anything substantial, I'll chime back in. :)