Bug 459407 - External monitor wallpaper gets corrupted with second wallpaper if external screen has higher resolution.
Summary: External monitor wallpaper gets corrupted with second wallpaper if external s...
Alias: None
Product: plasmashell
Classification: Plasma
Component: generic-multiscreen (show other bugs)
Version: 5.25.5
Platform: Arch Linux Linux
: NOR normal
Target Milestone: 1.0
Assignee: Plasma Bugs List
Depends on:
Reported: 2022-09-19 17:24 UTC by petrk
Modified: 2022-09-22 21:21 UTC (History)
3 users (show)

See Also:
Latest Commit:
Version Fixed In: 5.26

Issue present on a screenshot (3.26 MB, image/png)
2022-09-19 17:24 UTC, petrk

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Description petrk 2022-09-19 17:24:32 UTC
Created attachment 152231 [details]
Issue present on a screenshot

I run two displays, 1080p internal and 1440p external, external is being driven by Nvidia, as verified by gpu not idling in nvidia-settings.
If I set same resolution for both displays, changing screen layouts proceeds smoothly with no glitches, howerver if external runs at higher resolution and I switch to external only, I get wallpaper corruption.

1. Set higher resolution on secondary screen.
2.  Switch between internal only, extended, and finally to external only, just to make sure that more than one wallpaper is cached.
3. In external only mode two wallpapers are present, main on the left, and a piece of second on the right.
4. Clicking on desktop makes main wallpaper span whole desktop, switching to some application brings the glitch back, clicking back and forth fixes it eventually.

Two wallpapers are present on a single screen

Only one wallpaper should be present when only one screen is being driven.

Operating System: Arch Linux
KDE Plasma Version: 5.25.5
KDE Frameworks Version: 5.98.0
Qt Version: 5.15.6
Kernel Version: 5.19.9-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 16 × AMD Ryzen 7 4800H with Radeon Graphics
Memory: 15.0 GiB of RAM
Graphics Processor: AMD RENOIR
Manufacturer: LENOVO
Product Name: 82B1
System Version: Lenovo Legion 5 15ARH05H
Comment 1 petrk 2022-09-19 18:31:24 UTC
Appears to be fixed in 5.25.90.
Comment 2 Nate Graham 2022-09-22 18:45:07 UTC
Same underlying issue as Bug 456122. This is fixed in Plasma 5.26 (not the beta, but the final version)!
Comment 3 petrk 2022-09-22 21:21:57 UTC
I think I also saw something similar happen to logout screen as well. I'll wait for 5.26, and report back if it happens again.