alsa-project/alsa-ucm-conf issue #80 was opened from plbossart:

UCM files assume that when SOF is used, the number of DMICs is between 1 and 4.

That's an invalid assumption in the following two cases: a) the user plays with kernel parameters to select SOF on a platform without DMIC options snd_intel_dspcfg dsp_driver=3 b) the user plays with kernel parameters to work-around invalid dmic information, e.g. for UpExtreme the NHLT information reports 4 microphones but none are attached to the connector by default options snd_sof_intel_hda_common dmic_num=0

In those two cases, the only solution is to comment out the entire 'Mic1' section in ucm2/sof-hda-dsp/HiFi.conf. It'd be nicer to detect this case with the component information

The machine driver currently only provides the cfg-dmics component string when the real or overridden number of dmics is > 0. The component string is as follows

```` amixer -Dhw:0 info Card hw:0 'sofhdadsp'/'AAEON-UP_WHL01-V1.0' Mixer name : 'Realtek ALC892' Components : 'HDA:8086280b,80860101,00100000 HDA:10ec0892,160d0892,00100302' Controls : 40 Simple ctrls : 15 ```` Reported by @worldgeek and confirmed on my platform.

@perexg @kv2019i @libinyang FYI

Issue URL : https://github.com/alsa-project/alsa-ucm-conf/issues/80 Repository URL: https://github.com/alsa-project/alsa-ucm-conf