Is this 'Internal Microphone' an unresolved bug?

What is this thing folks.
I haven't plugged any microphone into my motherboard... Is this a bug an unresolved issue? It seems to be functioning, but no sound is being inputted, obviously. I expected it to only appear when I actually plug in a microphone.
My built in sound chip is ALC1220.

Is there someone skilled who can show me the way? I'm really clueless about this problem. Thaaaaaanks very much.


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