Bug in the graphical interface.
The problem started after an update, but I don't know which version.
I tried to create a new user, to start the interface with the default configuration, but the problem continues.
This distortion happens all the time.
whenever you open a window, or even change tabs in chrome, distortion happens.
The problem also happens on the panel.

https://ibb.co/zHGfL0h

Does anyone know if this is a Plasma problem, or something else?

I have a AMD GPU board (r9 290), and I use opensource driver.

grub configuration, to load the driver

Code: Select all

radeon.cik_support=0 amdgpu.cik_support=1

How about some more information about your screen and how it is connected? With HDMI in particular always suspect a cable problem, those can be really annoying.
Which exact Plasma version, which Desktop Effects do you have enabled?

I use DVI connection.
Remembering that the problem only happens on the panel and in the application launcher.
And not on the entire screen.

Regarding the KDE configuration, I use the default.
In fact, in the print I took, it was with a user that I created, with the default configuration.

Graphical artifacts are notoriously difficult to debug, so if it is reproducible every time, try narrowing down if it is a Desktop Effect causing it by selectively disabling those.
I don't think it is a Plasma issue as the Plasmashell is not directly responsible for the graphical display, that is done via X or Wayland and KWin.
You can report this as a bug against KWin, but please, state the exact Plasma version, the distribution is simply not enough.

I reinstalled the system (opensuse tumbleweed), and problem continues.
https://ibb.co/b7dHH7j

Details of my system (KInfo)

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Operating System: openSUSE Tumbleweed 20210605
KDE Plasma Version: 5.21.5
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
Kernel Version: 5.12.9-1-default
OS Type: 64-bit
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-3770K CPU @ 3.50GHz
Memory: 15.5 GiB of RAM
Graphics Processor: AMD Radeon R9 200 Series


I did the same test with wayland, and the problem doesn't happen.
Most likely the problem is Xorg.

But plasma has had other problems on wayland.
example: open popup, menus, etc.
But this is another subject.

Did you report it as a bug on https://bugs.kde.org? Then please provide a link to the bug