Logitech C310 webcam background noise


I am trying to use a Logitech C310 webcam, and every time I turn it on it immediately starts a background noise, like a low hiss. I also have a headset with a microphone plugged in, so I don’t intend to use the camera’s own microphone. Since it is clearly caused by the camera (the headset by itself doesn’t generate any background noise), is there any way I could disable its audio input?

UPDATE: I have tried following the instructions here, but it did not work.

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