Audio problem with Intel HDMI/DP

[Steven Friedrich]

System Settings correctly identifies all three channels, .i.e, Rear 
stereo, Front stereo, and HDMI/DP 8ch.
When I try any of the 3 Test buttons, it claims:

Error trying to play a test sound.

The system said: "No such driver"

dmesg shows three pcm devices:

dmesg|grep pcm pcm0: <Realtek ALC671 (Rear Analog)> at nid 20 and 27 on 
hdaa0 pcm1: <Realtek ALC671 (Analog)> at nid 33 and 24 on hdaa0 pcm2: 
<Intel Kaby Lake (HDMI/DP 8ch)> at nid 3 on hdaa1

I wrote a sh script and can produce sound at pcm0 and pcm1, but not pcm2.

What driver does KDE believe is missing? This is a fresh install, 
installed software from packages, but switched to ports trying to find 
audio solutions.

I put hw.snd.default_unit=2 in /boot/loader.conf Still no sound from hdmi.
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