Hey guys. After 1 year with problems to make works headphone together
with mic, I got a solution for my ASUS S46CA, I think this can works for
you too.

First, I try a lot of options snd-hda-intel, but only works this:

options snd-hda-intel model=alc255-asus

for my ALC270.

But it is not enough.
I needed use hdajackretask
And force
   pin ID 0x1a to be "Headphone"
   pin ID 0x18 to be "Microphone"

if alc255-asus don't works for you, you can try another options, like: 
alc269-dmic, alc271-dmic, headset-mic, alc283-headset.
Don't forget to restart the machine after hdajackretask.

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https://bugs.launchpad.net/bugs/1304074

Title:
  [X550CC, Realtek ALC270, Black Headphone Out, Left] No sound at all

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