Comment 37 for bug 1523100

Same issue here. I have an Asus X540LA laptop with the same chipset and the headset mic doesn't work.

[ 1.576056] snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
[ 1.612215] snd_hda_codec_realtek hdaudioC1D0: autoconfig for ALC255: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
[ 1.612220] snd_hda_codec_realtek hdaudioC1D0: speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
[ 1.612224] snd_hda_codec_realtek hdaudioC1D0: hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
[ 1.612226] snd_hda_codec_realtek hdaudioC1D0: mono: mono_out=0x0
[ 1.612228] snd_hda_codec_realtek hdaudioC1D0: inputs:
[ 1.612231] snd_hda_codec_realtek hdaudioC1D0: Mic=0x1b