Bug 432286 - transparency+blur glitching with obscured animated windows underneath
Summary: transparency+blur glitching with obscured animated windows underneath
Status: CONFIRMED
Alias: None
Product: kwin
Classification: Plasma
Component: effects-various (show other bugs)
Version: 5.24.2
Platform: Other Linux
: NOR normal (vote)
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-01-29 18:32 UTC by pmargeti34
Modified: 2022-05-08 15:25 UTC (History)
7 users (show)

See Also:
Latest Commit:
Version Fixed In:


Attachments
showcase (1.25 MB, video/webm)
2021-01-29 18:32 UTC, pmargeti34
Details
the bug with Yakuake (1.76 MB, video/mp4)
2022-05-08 15:25 UTC, S. Christian Collins
Details

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Description pmargeti34 2021-01-29 18:32:10 UTC
Created attachment 135290 [details]
showcase

SUMMARY
There are visual glitches when using konsole with transparency and blur enabled
when there is a window updating it's contents constantly and there's at least
one window between konsole and the updating window.

STEPS TO REPRODUCE
1. open program that actively repaints it's screen (e.g. audacious while playing, warframe launcher)
2. open some other program (e.g. dolphin, system settings) and position it over the program as described in 1)
3. open konsole with enabled transparency and blur

OBSERVED RESULT
Konsole will display rectangles and glitch in the areas which are updated in the program opened under 1)

EXPECTED RESULT
Konsole doesn't render updates happening in culled windows

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: archlinux
(available in About System)
KDE Plasma Version: 5.20.90
KDE Frameworks Version: 5.78
Qt Version: 5.15.2

ADDITIONAL INFORMATION
x11, didn't test in wayland
Comment 1 pmargeti34 2021-01-29 18:37:26 UTC
Also, tested in wayland session, same thing happens.
Comment 2 integro___ 2021-06-25 12:35:59 UTC
> Also, tested in wayland session, same thing happens.

I use plasma 5.22.2 (kde neon, amd), and the bug still happens. I also have this on my laptop (intel) with kubuntu (plasma 5.18.5)
Comment 3 p1n.06 2022-02-27 20:28:09 UTC
Operating System: Arch Linux
KDE Plasma Version: 5.24.2
KDE Frameworks Version: 5.91.0
Qt Version: 5.15.2
Kernel Version: 5.16.11-zen1-1-zen (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i3-9100F CPU @ 3.60GHz
Memory: 31.3 ГиБ of RAM
Graphics Processor: NVIDIA GeForce GTX 1060 3GB/PCIe/SSE2
Comment 4 Patrick Silva 2022-03-01 11:19:59 UTC
I saw a similar bug with popups of systray icons on Wayland session of Plasma 5.24.2 two days ago on Arch Linux. I use intel iGPU.
Comment 5 rabin 2022-03-31 08:54:47 UTC
I have this issue as well with 
Fedora 35 & nvidia GPU on X11
Comment 6 S. Christian Collins 2022-05-08 15:25:58 UTC
Created attachment 148665 [details]
the bug with Yakuake

With Yakuake (blur+transparency enabled), this bug can also be triggered without an animated window (see attached video):
1. Open Firefox (fullscreen).
2. Open KCalc and position it behind where Yakuake will open.
3. Open Yakuake and move mouse around the screen.

RESULT: the blur flickers and glitches where the KCalk window is.