https://bugs.kde.org/show_bug.cgi?id=454658
Bug ID: 454658
Summary: Blur effect is badly compatible with window opacity
(Meta+Scroll)
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: m...@ratijas.tk
Target Milestone: ---
Created attachment 149357
--> https://bugs.kde.org/attachment.cgi?id=149357&action=edit
Plasma blur + window opacity scroll
SUMMARY
Not sure if Meta+Scroll is the default, but it is set up to change window
opacity on my system. It is probably not a mainstream and quite a corner case
feature, except… more on that later.
This opacity does not play well with the blur effect behind windows. The way
the blur implemented is that it is an additional layer behind the window
blending layer. So when the window's opacity is reduced to zero, the blur
behind it comes forward as a light e.g. blue color, much lighter than the
background which it blurs.
The window opacity may be changed by other means, of course, one of which is to
have it always on (like was doing few years ago, so I could always peek behind
any currently front window), another is to animate window opacity e.g. on show
and hide.
STEPS TO REPRODUCE
1. Enable the Blur and Background contrast effects.
2. Reduce windows opacity down or close to zero.
OBSERVED RESULT
Light blurred background instead of a truly transparent window. Actually, the
"light" part of it is caused by the "Background contrast" effect.
EXPECTED RESULT
Blur, contrast and the window content should change transparency all together
at once.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.25.80
KDE Frameworks Version: 5.95.0
Qt Version: 5.15.4
Kernel Version: 5.18.0-arch1-1 (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-6700HQ CPU @ 2.60GHz
Memory: 15.6 GiB of RAM
Graphics Processor: NVIDIA GeForce GTX 970M/PCIe/SSE2
ADDITIONAL INFORMATION
Also, Meta+Scroll is being passed down to whatever is under the cursor as just
scrolling events, causing all sorts of incidents like the keyboard layouts
switching, volume & brightness changing and random accidental page scrolling.
But that's a totally different issue to handle.
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