Re: 8-channel HDMI outputs show up as 2 channels only on recent Intel laptop

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?

peter


On 7/13/22 19:10, Peter F. Patel-Schneider wrote:
> alsa-info.sh upload at
>
> http://alsa-project.org/db/?f=c20d56cb6e1d63e06ebae27b806abfdb66874718
>
>
>
> 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,
>>> including
>>> snd_hda_codec_hdmi.  Here is the information for one of the
>>> channels
>>> from /proc/asound/card0/codec#2.
>> […]
>>
>>> But as far as I can tell ALSA is turning them into 2-channel
>>> outputs.
>>> 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
>>> is
>>> 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,
>>
>> Paul
>>
>>
>> [1]: https://www.alsa-project.org/alsa-info.sh


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