Comment # 11 on bug 1143139 from Takashi Iwai

(In reply to Mykola Krachkovsky from comment #3)
> So, openSUSE:Factory still has files for 5.1.16 kernel, so I've been able to
> download them and install manually. At least I have working system now.

You may still find the old kernel in TW history repo,
  http://download.opensuse.org/history/

Also I have a collection of old kernels in my repos, e.g.
  http://download.opensuse.org/repositories/home:/tiwai:/kernel:/5.1/standard/

(In reply to Mykola Krachkovsky from comment #2)
> So, I've checked. 5.2.2 is affected too. And despite I've checked 5.1.16
> kernel as locked with `zypper al` it was removed. So I have no usable system
> right now. What the heck? Why it was removed?

Because you still have a kernel-default package on your system even after
removing an old one.  The multi-version packages are managed in a different way
and the number of installed packages is specified in /etc/zypp/zypp.conf.  Edit
the multiversion.kernels line in that file to allow more instances.

In anyway, if the problem persists and 5.1.x is confirmed to work as is, please
boot with drm.debug=0x0e option on both working and non-working kernels, and
upload the dmesg outputs to Bugzilla, too.