https://bugs.kde.org/show_bug.cgi?id=403812

Sergey <ser...@mytsyk.net> changed:

           What    |Removed                     |Added
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                 CC|                            |ser...@mytsyk.net

--- Comment #1 from Sergey <ser...@mytsyk.net> ---
I have such issue also.
After update (08.02.2019) system has artefacts on windows, windows not
rendering and blinking Desktop.  It's happeness when I use the nouveau driver.
There is no such issue, when using NVIDIA proprietary drivers (for sample
nvidia-340)
When I use nouveau, it issue happening on Compositor rendering backend: OpenGL
2.0 or 3.1.  When I choose Xrender it doesn't happen.

STEPS TO REPRODUCE
1. turn on computer effects enabled with OpenGL 2.0/3.1
2. relogin

SOFTWARE/OS VERSIONS
Operating System: KDE neon 5.14
KDE Plasma Version: 5.14.5
Qt Version: 5.12.0
KDE Frameworks Version: 5.54.0
Kernel Version: 4.15.0-45-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i3 CPU M 330 @ 2.13GHz

lspci 
01:00.0 VGA compatible controller: NVIDIA Corporation GT218M [GeForce 310M]
(rev a2) (prog-if 00 [VGA controller])
        Subsystem: Lenovo GT218M [GeForce 310M]
        Kernel driver in use: nouveau
        Kernel modules: nvidiafb, nouveau

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