Comment # 2 on bug 1213778 from Takashi Iwai

We should check both old and new kernels.  Could you try the Leap 15.5 GM
kernel (kernel-default-5.14.21-150500.53.2) kernel at first, for verifying
whether it's a post-GM regression?

If the GM kernel shows the same problem, please try the kernel in OBS
Kernel:SLE15-SP5 repo.
  http://download.opensuse.org/repositories/Kernel:/SLE15-SP5/pool/