--- Comment #8 from Takashi Iwai <tiwai(a)suse.com> ---
Kernel has a few different drivers for the Intel chip, one is the standard
(legacy) HD-audio driver, and another is ASoC Intel SST driver. There is a
newcomer, ASoC SOF Intel HD-audio driver, too.
The last two support the built-in mic (d-mic) that is driven over another bus
than HD-audio bus, and they need own firmware files.
The firmware file, skl_hda_dsp_generic-tplg.bin, could be compiled from the
standard file included in alsa-topology-conf package.
Could you try the following?
% sudo zypper in alsa-topology-conf
% alsatplg -c /usr/share/alsa/topology/hda-dsp/skl_hda_dsp_generic-tplg.conf -o
% sudo cp skl_hda_dsp_generic-tplg.bin /lib/firmware
Then reboot and retest.
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