RE: XPS 15 9560 Headphone jack function as a mic jack?
@Aaron, what do you mean you don't have an option for a mic? You originally said that one of the options is "Mic In". That's your mic option. But if you're plugging the headphone and mic jacks in one at a time, try instead plugging both of them into the adapter and then plugging the adapter in as a single unit, and then selecting the headset option. You do NOT want to plug them in sequentially.