Your laptop's internal mic is part of the webcam module, NOT the realtek module. That's why it is listed as not plugged in because that is for the 3.5mm headset mic or 3.5mm lapel mic.
Disconnected Realtek Internal Microphone
Ok, so I have an Acer Aspire A515-57 and my built-in/internal mic is showing up as not plugged in.
As of writing this post, I have tried updating my drivers as well as restarting AND resetting my laptop. I'm pretty sure this isn't a hardware issue (there's a SMALL chance it might be it be, although I wouldn't even know how to fix that).
Realtek High Definition Audio doesn't appear anywhere and updating the drivers didn't do anything. It seems a little silly to me that a built-in/internal mic can be unplugged?
Anyways, if anyone has any suggestions on how I can fix this, I'd appreciate it