Hi, I use Plasma (currently 5.13) on Tumbleweed on a reliable Thinkpad T530
laptop with integrated Intel graphics. (Attaching hwinfo)

I am experiencing random freezes of the Plasma desktop. The mouse still moves,
but no response from clicking anywhere. I tried killing the Plasma shell
related processes in a virtual terminal, but it doesn't help. It's completely
random, but happens several times a day and results in lost work.

I suspect that this is due to a bug in the Xorg Intel driver. I have not tried
the fixes yet, such as switching from SNA to UXA acceleration. First I want to
try switching the KWin compositor from openGL to Xrender, which I just now did.
If that doesn't help, I'll probably just uninstall the Intel driver and use
Xmodesetting.

These are probably related bugs, but from Leap:
- https://bugzilla.opensuse.org/show_bug.cgi?id=945444
- https://bugzilla.opensuse.org/show_bug.cgi?id=1014999
- https://bugzilla.opensuse.org/show_bug.cgi?id=1047716