Comment # 7 on bug 1172498 from Takashi Iwai

Thanks.  The working one is much older kernel, so something has changed
recently in the upstream, I suppose.

The fact that TW alsa-info.sh doesn't contain the Nvidia HDMI audio PCI entry
at all.  It means that the problem is rather deeper than the sound driver but
in PCI core or such low level stuff.

In anyway, TW already moved to 5.7, so we should check whether the issue is
present on 5.7 kernel.  Could you try to install the kernel from OBS
Kernel:stable repo?
  http://download.opensuse.org/repositories/Kernel:/stable/standard/
Get alsa-info.sh output, and also attach the output of dmesg after the boot,
too.