Comment # 6 on bug 1229191 from Takashi Iwai

The errors are very likely the same shown in the upstream bug report
  https://bugzilla.kernel.org/show_bug.cgi?id=218221
and it's closed as a Mesa issue.

In anyway, I guess the nouveau support of GSP firmware is still experimental.
If you have to stick with nouveau, it might be better to try the recent
upstream kernel from OBS Kernel:stable:Backport repo at first.

If the problem persists there, it should be reported to the upstream
gitlab.freedesktop.org Issues.  OTOH, if it works better, we have a chance to
backport the fixes.  Let me know if it works.