The internal microphone doesn’t work on my Dell Inspiron 14 7440 running ubuntu, though it is recognized on windows and I remember it working before I reinstalled the ubuntu system. When I open sound settings, the app doesn’t recognize the internal microphone: Screenshot

I ran alsamixer (newest version) in the terminal and didn’t see the internal microphone, this is what it looked like: This screenshot shows all devices listed in alsamixer.)

I also looked at pavucontrol and the app shows the internal microphone as “unplugged”: Screenshot

How can I get the microphone working?