Bug 513087 - Video has become unstable since update to Plasma 6.5 with Intel Arc B580 video card
Summary: Video has become unstable since update to Plasma 6.5 with Intel Arc B580 vide...
Status: NEEDSINFO WAITINGFORINFO
Alias: None
Product: kwin
Classification: Plasma
Component: compositing (other bugs)
Version First Reported In: 6.5.1
Platform: Other Linux
: NOR major
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: regression
Depends on:
Blocks:
 
Reported: 2025-12-08 15:07 UTC by Marc Sitkin
Modified: 2026-01-08 18:46 UTC (History)
4 users (show)

See Also:
Latest Commit:
Version Fixed/Implemented In:
Sentry Crash Report:


Attachments
A video showing glitches in Bazzar (2.18 MB, video/webm)
2025-12-08 15:07 UTC, Marc Sitkin
Details

Note You need to log in before you can comment on or make changes to this bug.
Description Marc Sitkin 2025-12-08 15:07:30 UTC
Created attachment 187427 [details]
A video showing glitches in Bazzar

SUMMARY
On Aurora Linux two applications, Bazzar and the pyxis terminal show glitches that look like compositor problems when using the Intel Arc B580 graphics card. This occured after the change from Plasma 6.4 to 6.5. Other applications do not seem to have this issue. Switching the monitor to video output from the mother board (CPU video) eliminates the issue.

STEPS TO REPRODUCE
1. Open a terminal or the Bazzar store
2. Move mouse in the opened windows, or wait a bit
3. 

OBSERVED RESULT
Windows exhibit graphic artifacts including white and colored blocks, and broken text

EXPECTED RESULT
Clean display of window content

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
(available in the Info Center app, or by running `kinfo` in a terminal window)
Linux/KDE Plasma: Aurora 43
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1

ADDITIONAL INFORMATION
Comment 1 Zamundaaa 2026-01-08 18:46:14 UTC
Please attach the output of
> drm_info
and
> kscreen-doctor -o
and
> vulkaninfo

Both Bazaar and Ptyxis are GTK4 apps that use Vulkan. It sounds like there could be a problem with explicit sync. If you run for example
> vkcube --wsi wayland
does that also show glitches?

When you wrote "Switching the monitor to video output from the mother board", are you just switching the display or also rebooting in between?