control.10 {
                iface MIXER
                name 'Capture Source'
                value 'Internal Mic'
                comment {
                        access 'read write'
                        type ENUMERATED
                        count 1
                        item.0 'Headphone Mic'
                        item.1 'Headset Mic'
                        item.2 'Internal Mic'
                }
        }
        
        control.17 {
                iface CARD
                name 'Headphone Mic Jack'
                value true
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }
        control.18 {
                iface CARD
                name 'Headset Mic Phantom Jack'
                value true
                comment {
                        access read
                        type BOOLEAN
                        count 1
                }
        }

Headset Mic Phantom Jack - indicates headset jack where hardware can not
      distinguish between headphones and headsets


do capture mean hardware cannot distinguish bewteen headset Mic ,Mic or 
headphone ?

if driver set it to headphone mode by default

how do the user switch between headphone, headset , mic mode without
using pa_backend.c for those who don't use pulseaudio ?

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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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