[Bug 237340] Unable to make HDMI sound works with HD630

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=237340

Richard Russo <freebsd@ruka.org> changed:

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--- Comment #27 from Richard Russo <freebsd@ruka.org> ---
I put together a bit towards the beginnings of getting this to work better on a
github issue https://github.com/freebsd/drm-kmod/issues/187

That patch would need a lot of polishing to be ready, but on the system I was
working with, sending the codec an intel specific command enabled the audio
outputs to be detected and used.

At least for Haswell/Broadwell, there's cross linked audio and video clocks,
and the patch just has what worked for me in terms of making the audio sound
right; at least for those two cores, audio and video drivers need to
communicate, and I don't know how to accomplish that.

This patch also would need to tailored to only apply on specific cards, not
just generally like I did for expediency.

Finally, at least on my hardware, I was seeing the audio output stop responding
after some amount of idle time --- that would hopefully get debugged at some
point, but it worked enough for me so I stopped.

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