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

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

brtastic.dev@gmail.com changed:

           What    |Removed                     |Added
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                 CC|                            |brtastic.dev@gmail.com

--- Comment #26 from brtastic.dev@gmail.com ---
Having this issue on Thinkpad T480 (with HD Graphics 620) on FreeBSD 12.3.

Installed devices:
pcm0: <Realtek ALC257 (Analog 2.0+HP/2.0)> (play/rec) default
pcm1: <Realtek ALC257 (Right Analog Mic)> (rec)
pcm2: <Intel Kaby Lake (HDMI/DP 8ch)> (play)
No devices installed from userspace.

Sound is not sent over HDMI when using pcm2. However, this laptop also has an
USB-C port capable of video output. I purchased USB-C -> HDMI adpater cable and
use that instead (labelled DP-1 in xrandr). Audio goes through without problems
on pcm2 in this setup.

I wonder if there should be more output options (separate devices for HDMI /
USB-C) or if the system would select the actual port depending on what I have
attached, same as with audio jack port (headphones)?

Anyway, would be nice to be able to just use HDMI instead of buying extra
cables.

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