My laptop's screen flickers so much with 5.13.12 that it renders my laptop
unusable. 

One workaround is to close and open the lid. After resuming, it works fine -
there is no flickering.

Booting up from the KDE Live image works fine. I have used the same Tumbleweed
version (20210820) as the one I have installed on my laptop. The only
difference is that I have an encrypted /home partition on my laptop's SSD.

Tested kernels:
5.10.16-1.3: OK
5.11.4-1.3: NON-OK
5.12.12-1: NON-OK
5.13.12-1: NON-OK


KDE Plasma 5.22.4
KDE Frameworks 5.85.0
Qt 5.15.2

See the attachments for more details.