How to make Integrated and 3.5 jack Microphones distinct?

[arlab]

Hi. T61p has an integrated microphone (SoundMAX Integrated Digital HD Audio).

I have an external microphone with a 3.5 jack. When I plug it in, Windows, instead of displaying two microphones, displays only the external one, but also recognizes it as SoundMAX Integrated Digital HD Audio.

Is there a way to separate these two microphones?

Note: When I use an USB adapter, Windows recognizes both mics. But I'm trying to know if it's possible to find a solution without using an adapter.

BTW, I'm using Vista Ultimate x64.

[yak]

I'm not sure but I guess that the internal mic is cut off then you connect an external one via the 3.5mm jack. The external one then simply replaces the internal one. A lot like the speakers get cut off when you connect headphones.

[arlab]

I see... Does that mean that I can't have both mics?

[yak]

If my assumption is right, no. It means that you can have either the built-in one or an external one.