Comment 14 for bug 1257956

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=7369a53ab5f606e87a3cd1cd4eebd40226bab090

http://cgit.freedesktop.org/pulseaudio/pulseaudio/commit/?id=ca4942e89cf462e5f8c36ca9b8b689879083af6b

it seem that you need to create two jack detection controls instead of one headphone mic jack control

headphone jack and mic jack detection control at same nodes

the return value of headphone jack and mic jack depends on whether the jack is retasked as headphone or mic jack

headphone jack return false whenever the jack is retasked to mic
mic jack return false whenever the jack is retasked to headphone