Comment 48 for bug 1252733

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Gabriele (questaemia) wrote :

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.