spec->gen.hp_mic = 1;
 /* Mic-in is same pin as headphone */ 
/* Disable boost for mic-in permanently. (This code is only called              
  
 from quirks that guarantee that the headphone is at NID 0x1b.) */ 
snd_hda_codec_write(codec, 0x1b, 0, AC_VERB_SET_AMP_GAIN_MUTE, 0x7000); 
snd_hda_override_wcaps(codec, 0x1b, get_wcaps(codec, 0x1b) & ~AC_WCAP_IN_AMP);



Is there any reason to enable headphone mic when boost cannot be enabled ?


spec->gen.hp_mic = 1; 

This seem force the driver not creating Front Headphone Jack ?



Do

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https://bugs.launchpad.net/bugs/1509921

Title:
  [HDA-Intel - HD-Audio Generic, recording] No sound at all

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