https://bugs.kde.org/show_bug.cgi?id=450779
Bug ID: 450779
Summary: Strange background pattern/dithering on Wayland
session
Product: kwin
Version: 5.24.1
Platform: openSUSE RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: kwin-bugs-n...@kde.org
Reporter: skylake...@gmail.com
Target Milestone: ---
Created attachment 147091
--> https://bugs.kde.org/attachment.cgi?id=147091&action=edit
Notice how the header and icons, which should be solid, have a pattern. the
blur effect also has this problem, just like everything else on the Wayland
session.
SUMMARY
There is a dithering or background pattern across all the screen when using the
Wayland session. See the attached picture and Reddit post for concrete
examples.
***
STEPS TO REPRODUCE
1. Login to a Wayland session.
2. Watch the screen, and notice a pattern that does not appear using the X11
session.
OBSERVED RESULT
A dithering/background pattern appears all over the screen, on the wallpaper,
the windows (on both Qt and GTK), applets, etc. It's especially (but not
exclusively) noticeable on backgrounds that should be a single solid color.
EXPECTED RESULT
No distortion caused by the aforementioned dithering pattern. Colors should be
as smooth as in the X11 session.
SOFTWARE/OS VERSIONS
Linux: 5.16.10-1-default (64-bit)
KDE Plasma: 5.24.1
KDE Frameworks: 5.90.0
Qt Version: 5.15.2
OpenSUSE Tumbleweed 20220222
RELEVANT HARDWARE
Graphics Processor: Mesa DRI Intel® HD Graphics 4400
ADDITIONAL INFORMATION
A Reddit user (Zamundaaa) suggested sharing the output of drm_info, and
checking the driver used by Xorg in my system.
drm_info output on Wayland: https://pastebin.com/db6U4Nd3
As far as I can tell, my system uses modesetting driver on Xorg.
Relevant Reddit post with more examples:
https://www.reddit.com/r/kde/comments/srlycr/theres_some_weird_dithering_effect_going_on_in/
Changing the RGB Range setting to either Full, Limited, or Auto, does not fix
the problem. Neither does adding "KWIN_DRM_PREFER_COLOR_DEPTH=24" into the
/etc/environment file and rebooting.
While I'm using OpenSUSE Tumbleweed, this problem persisted after changing the
default repos to the master-git KDE repos (OpenSUSE Krypton). I'm no longer
using Krypton, so I'm filling this bug report with my current setup. The
creator of the Reddit thread uses Arch Linux, but has the same graphics
processor, and also suffers from this problem.
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