https://bugs.kde.org/show_bug.cgi?id=406307
--- Comment #2 from Vladislav Rubtsov <rubs...@gmail.com> ---
UPDATE #2:
The problem doesn't occur in Wayland sessions.
So, after a lot of experimentation with video drivers and Xorg configuration I
was able to fix this issue. That involved switching back and forth between
Nvidia and Nouveau drivers via the Driver Manager (Ubuntu's version).
I'm still not sure how exactly it was fixed, but the one notable difference is
that modesetting driver is not loaded as seen in "inxi" output:
Graphics: Card-1: Intel HD Graphics 530 bus-ID: 00:02.0
Card-2: NVIDIA GM107M [GeForce GTX 950M] bus-ID: 01:00.0
Display Server: X.Org 1.20.1 drivers: nvidia (unloaded:
modesetting,nouveau)
Resolution: 1360x768@59.96hz, 1920x1080@60.00hz
OpenGL: renderer: GeForce GTX 950M/PCIe/SSE2
version: 4.6.0 NVIDIA 390.116 Direct Render: Yes
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