I plugged my microphone into the aux port and Windows detects that it has been plugged in. However it doesn’t detect it as an input, it adds additional options to the output dropdown menu. On Linux on another laptop I am able to set the aux port as input or output. But I am not sure the hardware is capable of doing that or if it’s a Windows limitation.
There’s been some confusion on the forums in the past, but unfortunately, in reality it is a standard TRRS headphone jack with a dedicated contact for mono microphone input. If your mic is meant to be plugged into an audio interface or mixer, it won’t work in this aux port, which can’t change the mode of the port. I’ve never seen a laptop that could do that, I must say that’s a nice feature.
My friend has a TRRS jack on his laptop and is able to configure it as audio output or microphone input in arch. I’ll ask him what audio set up he’s using. If it’s a part of the DE, he runs KDE. But he’s heavily into speaker systems, he’s put a lot of time into configuring pulse audio and Pipewire and is now trying the DAWs for Linux but says they annoying compared to Windows.