Comment # 27 on bug 1014999 from leon c

I have a problem that may be related:
Opensuse Leap 15.0 fresh install on Thinkpad T420s which has both Intel and
nVidia graphics. I didn't have problems on 42.2 and 42.3 but started seeing
problem about a month ago. 

After some use (web browsing, doxbox) or after resuming from sleep the clicks
on k-menu and window decorations do nothing, win-key does not open k-menu and
also right click no longer brings a menu. If I restart X or kill all my
processes from virtual console and log back in it works. At first I thought it
was nVidia driver issue. From the start I was using only nVidia GPU with Intel
disabled in BIOS.  I tried older and different nVidia drivers. Then I thought
it was thermal issue and blew the dust. Then I tried disabling nVidia GPU and
enabling Intel only. At this point the system runs much cooler - 50C when idle,
which is normal in summer for a thin laptop. I tried clean install with nothing
from any non-official repos and after some time the taskbar, menu and maximize
buttons become non-responsive.

Seems common pattern here is Plasma and Thinkpad.