Comment # 2 on bug 1213777 from Takashi Iwai

Could you check whether the problem still appears with the latest kernel in OBS
Kernel:SLE15-SP4 repo?

Also, it'd be helpful if you can narrow down the kernel regression range, too.
e.g. does *-66 kernel still work or already broken?

If *-66 works, it might be the bug 1213304, and I asked for testing a few more
kernels to narrow down more.

Or, if *-66 is already broken, the bug must be between *-63 and *-66.  There
are quite a few kernels available in KOTD archive
  https://kerncvs.suse.de/kernel-overview/?b=SLE15-SP4;a=kotd;p=sle15-sp4
so you can try it out to figure out the culprit commit.