Comment # 4 on bug 1132439 from Larry Finger

(In reply to Axel Braun from comment #3)
> (In reply to Ludwig Nussel from comment #2)
> > in 15.0 it worked?
> 
> Yes, with 15.0 client I had no issues

Yes, it is a 15.1 problem in that module vboxvideo.ko is missing. That is the
video driver for VB, Without it, only a simple graphics screen is available.

Modern kernels such as used by Tumbleweed have that module built into the
kernel, but the older 4.12.X kernels used by Leap 15.1 do not. In a recent
change, I was asked if it would be OK to use the same source for both TW and
Leap 15.1. I failed to remember this problem, and said OK. Now, I have to
restore the build of the kernel module on Leap 15.1 while not breaking the TW
build.

I do not have an estimate on how long this will take, but as soon as I have a
fixed repo at OBS, I will give a link here.