Hello,
I'm running bookworm on a Thinkpad T14s Gen4 AMD and am having an issue with the internal microphone. Using the kernel from bookworm, the microphone doesn't work at all, so I installed kernel 6.12 from backports. Now the microphone works when I boot, but at some point, it stops working until I reboot. I haven't been able to find any pattern in when it stops working. And when it stops, it's still detected (for example, I see it in pavucontrol, and the configuration is unchanged) but it doesn't seem to register any input (in pavucontrol, the VU meter doesn't move, and I can't record audio in any applications). I'm using pipewire.
Any suggestions for how I can go about diagnosing the issue? I've tried restarting pipewire and wireplumber, but that doesn't do anything; the only way I've found to get the microphone working again is to reboot.