I have an Acer Aspire V15 Nitro Laptop that only sports a combo jack for both microphone and headphones at the same time. It was always a bit tricky but worked until I reinstalled Arch Linux recently.
Since then the microphone part has not been detected anymore.
pavucontrol, using the previously working configuration "Analog Stereo Duplex", I can only select "Analog Input" (the internal mic, which does not work as well). There is no other option for the port.
alsamixer shows no input devices at all.
How can I get my external microphone back working?
How can I see which devices are detected on a hardware level?