The internal microphone of my Lenovo T440p laptop has got better audio quality than the mic of my cheap headset. Whenever the headset is not plugged in, the internal mic is used, otherwise, the headset mic is used automatically. When I am trying to change the audio source back to the internal mic, I am unable to do so. The sound settings look the same no matter if the headset is plugged in or not. The only input device shown in the settings is "microphone array (Realtek High Definition Audio)". Why can I not see the two mics separately in the settings or in any application?