Comment 23 for bug 1864061

> Please add "options snd-hda-intel dmic_detect=0" in the /etc/modprobe.d/alsa-base.conf, then the legacy hda driver will work as before.

That workaround doesn't work on my Lenovo Carbon X1 gen7. It does let pavucontrol see the audio card again, but no adjustment in pavucontrol, alsamixergui or amixer actually results in audible sounds. Sound worked before my last dist-upgrade.