Digging a little further, it sure looks like somehow ALSA is not picking up the HDMI nature of my sound card.  The only option I have for sound in pulse audio volume control is Play HiFi quality Music and this has to come from ALSA.  There are several files in /usr/share/alsa/ucm2/Intel/sof-hda-dsp/ that appear relevant but I don't know how to interpret or debug them.

Is there documentation on how to debug ALSA ucm2 problems?


On 7/13/22 19:10, Peter F. Patel-Schneider wrote:
alsa-info.sh upload at


On Thu, 2022-07-14 at 00:53 +0200, Paul Menzel wrote:
Dear Peter,

Am 14.07.22 um 00:12 schrieb Peter F. Patel-Schneider:
I have an Ice Lake laptop with 3 8-channel HDMI outputs.  My kernel
appears to have the appropriate modules loaded for the card,
snd_hda_codec_hdmi.  Here is the information for one of the
from /proc/asound/card0/codec#2.

But as far as I can tell ALSA is turning them into 2-channel
At least I can not see any surround channels in alsamixer and I can
only play 2-channel sound to them using speaker-test.

How can I find out where the change from 8 channels to 2 channels
happening?  And how can I get 7.1-channel (or 5.1-channel) sound to
these outputs?
Please use `alsa_info.sh` [1] to upload more information.

Kind regards,


[1]: https://www.alsa-project.org/alsa-info.sh

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