https://bugs.kde.org/show_bug.cgi?id=469281
Bug ID: 469281
Summary: windows with background blur (e.g., konsole) flicker
and leave mouse trails
Classification: Plasma
Product: kwin
Version: 5.27.4
Platform: Gentoo Packages
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@kaishome.de
Target Milestone: ---
SUMMARY
When using kwin_wayland, windows which use transparency with background blur
flicker during screen updates and the mouse point may leave square blocks of
trails in the background color (as if no background blur was used). This can be
observed both with NVIDIA and Intel. Disabling background blur in konsole fixes
the issue but other windows may (and even the plasma panels) may still be
affected, tho the problem is most prominent with konsole.
STEPS TO REPRODUCE
1. Enable background transparency/blur in konsole
2. Update screen contents in konsole and move the mouse point around within the
window
3. Move the window around
OBSERVED RESULT
Trails of background-colored blocks are left behind the mouse cursor, konsole
window contents may flicker heavily.
EXPECTED RESULT
No flickering, no mouse trails.
SOFTWARE/OS VERSIONS
Operating System: Gentoo Linux 2.13
KDE Plasma Version: 5.27.4
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
Kernel Version: 6.1.26-gentoo (64-bit)
Graphics Platform: X11
Processors: 20 × 12th Gen Intel® Core™ i7-12700K
Memory: 31.1 GiB of RAM
Graphics Processor: NVIDIA GeForce RTX 3080 Ti/PCIe/SSE2
Manufacturer: ASRock
Product Name: Z690 Pro RS
ADDITIONAL INFORMATION
Also happens with Intel (Gen3 iGPU): Intel(R) Core(TM) i5-3470 CPU @ 3.20GHz
But usually, flickering cannot be observed with latest Plasma version but mouse
trails are still present. The flicker problem mostly went away after I bumped
the iGPU shared memory area from 32 to 512 MB (and it also fixed the lockscreen
freezing until I "loginctl unlock-session" from alt+F2 and restart kwin which
is not feasible with wayland).
I disabled konsole background blur on that iGPU for now because it really hurts
desktop rendering performance, so it less a problem on that iGPU anyways for me
which mostly lefts us with the issue on NVIDIA.
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