Bug 475064

Summary: Bizarre graphical glitches on half of one screen with complex triple-monitor arrangement
Product: [Plasma] kwin Reporter: Wesley M <wmprivacyemail>
Component: multi-screenAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: nate, xaver.hugl
Priority: NOR Keywords: multiscreen, wayland-only
Version First Reported In: 5.27.8   
Target Milestone: ---   
Platform: Fedora RPMs   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: Video Example
Wallpaper Change Test
Display Update Fix

Description Wesley M 2023-09-30 20:18:54 UTC 
SUMMARY
***
Wallpaper will sometimes resize on its own to a resolution smaller than the display is running, causing strange graphical glitches until the display is updated (move or resized) in the settings.
***


STEPS TO REPRODUCE
1. Unknown. Happens without warning. 

OBSERVED RESULT
It...happens?

EXPECTED RESULT
It shouldn't.

SOFTWARE/OS VERSIONS
Windows: n/a
macOS: n/a
Linux/KDE Plasma: Fedora 38
(available in About System)
KDE Plasma Version: 5.27.8
KDE Frameworks Version: 5.109.0
Qt Version: 5.15.10

ADDITIONAL INFORMATION
n/a
Comment 1 Wesley M 2023-09-30 20:42:53 UTC 
Created attachment 161978 [details]
Video Example

This shows the bug after it spontaneously occurred.
Comment 2 Wesley M 2023-09-30 20:44:08 UTC 
Created attachment 161979 [details]
Wallpaper Change Test

This shows a test where I changed the wallpaper. This did not affect the bug.
Comment 3 Wesley M 2023-09-30 20:44:51 UTC 
Created attachment 161980 [details]
Display Update Fix

This shows where I updated the display, which fixed the bug.
Comment 4 Nate Graham 2023-10-12 19:37:00 UTC 
What GPU hardware are you using on this system?
Comment 5 Zamundaaa 2023-10-12 21:33:30 UTC 

*** This bug has been marked as a duplicate of bug 469623 ***
Comment 6 Wesley M 2023-10-13 03:06:41 UTC 
(In reply to Nate Graham from comment #4)
> What GPU hardware are you using on this system?

I see the bug has already been marked as duplicate, but to answer your question, it's an AMD RX 580. The issue occurs even when there are no windows open on the monitor, and even when the system is sitting idle. It's unclear what the cause is.