Bug 500535

Summary: Wayland: Translucent window artifacts remain on wallpaper after minimizing inactive windows (NVIDIA RTX 3070)
Product: [Plasma] kwin Reporter: 2knchill <2knchill>
Component: effects-variousAssignee: KWin default assignee <kwin-bugs-null>
Status: RESOLVED DUPLICATE    
Severity: normal CC: 2knchill, kdedev
Priority: NOR    
Version First Reported In: 6.3.1   
Target Milestone: ---   
Platform: Arch Linux   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:

Description 2knchill@gmail.com 2025-02-21 17:44:06 UTC 
When window translucency is enabled in KDE Plasma, minimizing an inactive (translucent) window causes the translucent image to remain embedded in the wallpaper until either rebooting or running 'kwin_wayland --replace &'

Environment:
- KWin version: 6.3.1
- Distribution: Arch Linux
- Session type: Wayland
- GPU: NVIDIA RTX 3070
- NVIDIA driver: 570.86.16
- CPU: Ryzen 5800H

Steps to Reproduce:
1. Enable window translucency in KDE Plasma
2. Open any window and let it become inactive (translucent)
3. Minimize the translucent window
4. Observe that the translucent window image remains stuck on the wallpaper

Current Workaround:
Running 'kwin_wayland --replace &' temporarily fixes the issue until it occurs again.

Configuration:
~/.config/kwinrc contents:
[Compositing]
AnimationSpeed=2
Backend=XRender
GLCore=true
GLPreferBufferSwap=n
HiddenPreviews=6
OpenGLIsUnsafe=false
WindowsBlockCompositing=false

[Effect-translucency]
ComboboxPopups=81
Dialogs=80
Inactive=81
IndividualMenuConfig=true
MenuOpacity=100
MoveResize=100

[Plugins]
minimizeanimationEnabled=false
translucencyEnabled=true

Additional Notes:
- Issue persists regardless of compositor backend (OpenGL/XRender)
- Issue persists with different translucency settings
- Issue persists with minimize animations disabled
Comment 1 2knchill@gmail.com 2025-02-21 17:48:12 UTC 
Happens only if window is maximized.
Comment 2 2knchill@gmail.com 2025-02-21 17:54:36 UTC 
Ok nvm it has nothing to do with fullscreen or not, it's just if the window is in focus or not
Comment 3 TraceyC 2025-02-25 21:54:03 UTC 
I can reproduce this with kcm_kwin_effects on git-master

- Had two application windows open
- Enabled Translucency
- Minimized the non-focused window

Result: Ghost image of the app remains that can't be interacted with
Comment 4 TraceyC 2025-02-25 22:00:20 UTC 
This is actually a duplicate of bug 492684. Please follow that report for updates

*** This bug has been marked as a duplicate of bug 492684 ***