Bug 488351

Summary: Strange distortion under centred panel in KDE 6.0.5/Fedora 40
Product: [Plasma] plasmashell Reporter: Dave Thompson <dwt>
Component: PanelAssignee: Plasma Bugs List <plasma-bugs>
Status: RESOLVED DUPLICATE    
Severity: normal CC: duha.bugs, niccolo.venerandi
Priority: NOR    
Version: 6.0.5   
Target Milestone: 1.0   
Platform: Other   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: Screen capture of the panel with artefacts

Description Dave Thompson 2024-06-11 13:24:21 UTC
Created attachment 170370 [details]
Screen capture of the panel with artefacts

SUMMARY

Seeing strange artefacts around the KDE panel when it's in centred mode floating at the bottom of the screen. See screenshot that's attached to the report.

This is a fresh installation of KDE 6.0.5 on Fedora 40 using the Breeze Dark theme and a standard wallpaper.

Do note that this is an external screen connected to a (closed) laptop.

It appears the code that draws the shadow around the panel is not using the correct background to render the alpha-blended shadows on.

System details:
Operating System: Fedora Linux 40
KDE Plasma Version: 6.0.5
KDE Frameworks Version: 6.3.0
Qt Version: 6.7.1
Kernel Version: 6.8.11-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
Processors: 22 × Intel® Core™ Ultra 7 155H
Memory: 30.8 GiB of RAM
Graphics Processor: Mesa Intel® Arc
Manufacturer: LG Electronics
Product Name: 17Z90SP-E.ADB9U1
System Version: 0.1
Comment 1 Dave Thompson 2024-06-11 13:26:38 UTC
What's also interesting is that changing the wallpaper doesn't remove the artefact, nor does changing the size of the panel.
Comment 2 Dave Thompson 2024-06-11 15:44:53 UTC
Also, happens on all panels, not just the panel with the Task Manager on...
Comment 3 Dave Thompson 2024-06-11 17:48:21 UTC
Only happens when the panel is set to be transparent/translucent. If it's opaque the error is not seen.
Comment 4 Dave Thompson 2024-06-11 18:08:58 UTC
Ignore above - also happens on Opaque mode!
Comment 5 duha.bugs 2024-06-11 20:42:45 UTC

*** This bug has been marked as a duplicate of bug 488295 ***