I have had this on 19.10 (see https://bugs.launchpad.net/ubuntu/+source
/linux-oem-osp1/+bug/1864061/comments/42) and on 20.04.

Adding "options snd-hda-intel dmic_detect=0" to the end of
/etc/modprobe.d/alsa-base.conf has apparently fixed the issue on 20.04
(microphone is still working).

I probably would have tried this earlier if anyone (@Hui Wang ?) had
explained a bit more understandably what the problem is, what the
workaround does, why it fixes the issue, and what the possible side
effects are.

Also the bug description says this issue does not arise in focal
(20.04), which is incorrect in my and several other commenters' cases.

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https://bugs.launchpad.net/bugs/1864061

Title:
  PCI/internal sound card not detected

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