As well as the Mic not being detected, and therefore not available for use in any applications, there is an issue with the master audio volume being either full-on or muted. individual mixer controls still work, but the main volume control does nothing other than mute the audio.
Looks like the same issue I'm having on Thinkpad X1 Carbon 7th Gen running Ubuntu 19.04.
Debug output here: alsa-project. org/db/ ?f=5c09dfb7b0fc 0ff5ad32c057689 3316f5613d3a1
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As well as the Mic not being detected, and therefore not available for use in any applications, there is an issue with the master audio volume being either full-on or muted. individual mixer controls still work, but the main volume control does nothing other than mute the audio.