Comment # 47 on bug 1220569 from Takashi Iwai

Hmm, that's tough.  As this doesn't appear to be any logged error, it's hardly
recognizable from the kernel messages, too.

OK, then let's concentrate on SLE15-SP6 development and try to narrow down the
range there.

We have old SP6 kernels in kerncvs KOTD archive.
  https://kerncvs.suse.de/kernel-overview/?b=SLE15-SP6;a=kotd;p=sle15-sp6

For example, try this one on Aug 24, 2023:
  https://kerncvs.suse.de/kerneltest/suse/28f1b80/
The version is 6.4.12, and this should still work.

OTOH, the one almost corresponding to the version you tested 6.4.0-150600.5 is
on Jan 25, 2024:
  https://kerncvs.suse.de/kerneltest/suse/55022e2/
This should be broken.

If the former works and the latter broken, you can try to bisect the package
builds between them, as found in the KOTD archive list above.