Comment 9 for bug 1248116

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Raymond (superquad-vortex2) wrote : Re: PulseAudio switch rapidly port making the sound horrible

you can use hdajackretask to set Misc bit (MISC=NO_PRESENCE)

bit 8 of pin default of your headphone and mic at ext front

so that driver don't use jack detection on these two pin complex

or

change pulseaudio conf

http://cgit.freedesktop.org/pulseaudio/pulseaudio/tree/src/modules/alsa/mixer/paths

to ignore the state of these two jacks