Hello guys!

Since my last reinstall, I've encoutered weird bug. It happens every time the laptop goes to sleep. After I wake computer there is mess, and by mess I mean not loaded background image on login screen and not loaded icons in docks/panels. Instead of images only some king of white noise is displayed. It can be fixed by "manual rerender" of asset (every action that changes the asset, click, hover), but some doesn't have any kind of interactivity, therefore no way of fixing it. My guess is that OS unloads some stuff from RAM for better battery performance, but forgets it was unloaded and tries to display it.
Screenshots: https://imgur.com/a/RZxQG1Z

Which exact Plasma version, which distribution? Please be more precise in your questions.

Mamarok wrote:Which exact Plasma version, which distribution?

There is screenshot of neofetch included, but more detailed info is:
Kubuntu 19.04
KDE Plasma version: 5.15.4
KDE Frameworks version: 5.56.0
Qt version: 5.12.2
Kernel version: 5.0.0-32-generic
OS Type: 64-bit
NVIDIA Driver version: 440.26

Since Kubuntu 19.04 is not an LTS version, I suggest you upgrade to 19.10, so you have a newer Plasma version.

Upgraded to 19.10 and still having the same error :/

Operating System: Kubuntu 19.10
KDE Plasma Version: 5.16.5
KDE Frameworks Version: 5.62.0
Qt Version: 5.12.4
Kernel Version: 5.3.0-19-generic
OS Type: 64-bit
Processors: 4 × Intel® Core™ i5-6200U CPU @ 2.30GHz
Memory: 11,4 GiB of RAM

Do you use Kubuntu as is, or did you modify something in the basic display settings, or install other graphic drivers, use different docs? Mine is very vanilla, just switched to the Breeze Dark theme, and I see no problems. Mind you, I have an all Intel machine, including the graphic card, so might be caused by some graphic card driver issue.