In this configuration, HDAudio.sys sees only one detection event associated with the headphones, and there is no way a second event associated with the microphone can be triggered physically. The workaround mentioned in the article above does not work due to the particular way the TRRS jack and the audio chip (cs4206, cs4207 and cs4208) are wired in the MacBooks: only a single jack detection event is possible, and if one is detected, a value is set in the chip, which reports the presence of a microphone. It appears that the problem stems from Microsoft's HDAudio.sys driver: People are frustrated by the fact that the microphone on their headset is properly detected in OS X, but not in Windows/Bootcamp. In these, a single 3.5 mm jack connector is used to combine a stereo pair OUT with a mono microphone IN. The problem has been around for quite some time now, i.e., since the so-called TRRS jacks were introduced in MacBooks.
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