Delighted to report that after upgrading to 21.10, the microphone on a TRRS headset shows up and works normally! So for me at least upgrading to 21.10 solved this problem and didn’t introduce any new ones [EDIT: except for needing to hold the power button to power off fully]. (I did disable panel self-refresh in Grub after the upgrade, and I had already disabled trackpad PS/2 emulation in the BIOS.)
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