Comment # 10 on bug 1105974 from Takashi Iwai

There is little we can help about nouveau from our side for this kind of bug,
unfortunately.

Could you try the latest upstream kernel in OBS Kernel:stable repo, and see
whether the problem persists?  Just download the kernel-default.rpm from the
repository and install on top of your Leap 15.1 system.

If the problem persists with the upstream kernel, it's better to report to
upstream.  OTOH, if the latest upstream works, we still have some chance for
backporting a fix.