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(1) dell xps12 9q33 (codec: realtek ALC668) hiss/white noise on headphone
For headset jack is marked with the microphone terminal, I add the following to the /boot/device.hints as mic jack is recognized.
hint.hdaa.1.nid27.config="as=4 seq=0 device=Mic conn=Jack loc=Left ctype=1/8 color=Black misc=0"