I suspect something might be trying to use the mic as a line out. The mic signal seems to track the output volume (i.e.I've checked the headset mic is working and I'm not just using the inbuilt laptop mic. The headset (phones and mic) are definitely working - tested on my laptop (Dell Latitude 5480, also running Ubuntu 18.04).I do also have an nVidia RTX 3070 that I think also has its own audio codec.Motherboard: Gigabyte B550 AORUS Pro AX (for Ryzen processors), which has a Realtek ALC1220.The headset plugged into front audio port of a Lian Li Lancool 215, which according to the manual is a TRRS port.
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Shure SE215 with "RMCE-Universal Remote and Mic Compatible Universal Cable ", which has a built in mic.The headphones work fine, but the mic doesn't work - in sound settings and in pavucontrol, I'm getting no signal when I speak. I have a headset whose mic input isn't working on my desktop running Ubuntu 18.04.