Comment 30 for bug 1654448

There are multiple variables here you need to consider...

The headset socket is 4-contact to support headphones with built-in microphone. So if you plug in a 4-contact jack then you are more likely (not guaranteed) to get a clean connection (4 contacts touching 4 separate contacts).

However a "clean" connection is not helpful if you've plugged in the wrong type of headset. See there are different types (too many):

  https://technosyndicate.files.wordpress.com/2012/12/122312_0549_common35mm11.png
  http://www.cablechick.com.au/blog/understanding-trrs-and-audio-jacks/

So an imperfect connection is pretty common. And an imperfect connection might touch the laptop's mic contact to something else. In fact if you get a pair of Bose Quiet Comfort QC25 then you have a choice between buying one with Apple support or Samsung/Android support (although some stores will only stock Apple). One doesn't work in the other but they both appear to be identical 4-contact 3.5mm jacks.

Yes indeed this can be fixed in software to silence or reduce noise from the mic line. But remember it's a hardware problem as well as a software problem. You should try both hardware and software solutions.