I got a headset and tried it, no autodetection:
sound hdaudioC1D0: Headset jack set to headphone (default) mode.
Regarding 0x19, I guess you are right and it's required for microphones, but I
don't have one to test.
Anyway, the pop noise is heard when switching between these two (Node 0x19):
Pin-ctls: 0x21: IN VREF_50
Pin-ctls: 0x20: IN VREF_HIZ
VREF_50 is used with microphones, VREF_HIZ with headphones and headset.
The pop noise is not a big deal, is heard only once on boot and it's not
that loud.
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https://bugs.launchpad.net/bugs/1252733
Title:
[XPS 12-9Q33, Realtek ALC668, Black Headphone Out, Left] Background
noise or low volume
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