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[Raymond <1523100@xxxxxxxxxxxxxxxxxx>]

how do you test the internal mic ( recording using stereo or mono) ?

are the left and right channels out of phase ?

https://git.kernel.org/cgit/linux/kernel/git/tiwai/sound.git/log/sound/pci/hda/patch_realtek.c?qt=grep&q=alc255

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https://bugs.launchpad.net/bugs/1523100

Title:
  Alsa not detecting internal microphone [ALC255]

Status in alsa-driver package in Ubuntu:
  Confirmed

Bug description:
  I've just installed Ubuntu 16.04 alongside Windows 10 on a 64bit Acer
  Aspire VN7-792G and noticed, that the internal microphone doesn't
  work. The computer has been released a couple of months ago and it's
  Intel Skylake -based with a Sunrise Point -based motherboard.

  INFO: The problem exists in Ubuntu 15.10 too, only microphone jack
  detected. Currently using Ubuntu 16.04 for proper hardware support.

  Alsa reports the audio device to be:

  Card: HDA Intel PCH
  Chip: Intel Skylake HDMI

  The speakers are working fine, but both alsamixer and pavucontrol
  (Pulseaudio Volume Control) raport the unplugged external microphone
  connector as the only sound input.

  I have tried many of the alsa model configurations (options snd-hda-
  intel model=something) without success, alsa finds only the microphone
  jack, which works fine when I plug an external microphone in it.

  Here's some info:

  lspci | grep -I audio:

  00:1f.3 Multimedia audio controller: Intel Corporation Sunrise Point-H
  HD Audio (rev 31)

  cat /proc/asound/cards:

  0 [PCH            ]: HDA-Intel - HDA Intel PCH
                              HDA Intel PCH at 0x84320000 irq 128

  And a clip from dmesg | grep snd:

  [    3.019164] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops i915_audio_component_bind_ops [i915])
  [    3.047505] snd_hda_codec_realtek hdaudioC0D0: autoconfig for ALC255: line_outs=1 (0x14/0x0/0x0/0x0/0x0) type:speaker
  [    3.047508] snd_hda_codec_realtek hdaudioC0D0:    speaker_outs=0 (0x0/0x0/0x0/0x0/0x0)
  [    3.047510] snd_hda_codec_realtek hdaudioC0D0:    hp_outs=1 (0x21/0x0/0x0/0x0/0x0)
  [    3.047511] snd_hda_codec_realtek hdaudioC0D0:    mono: mono_out=0x0
  [    3.047512] snd_hda_codec_realtek hdaudioC0D0:    dig-out=0x1e/0x0
  [    3.047512] snd_hda_codec_realtek hdaudioC0D0:    inputs:
  [    3.047514] snd_hda_codec_realtek hdaudioC0D0:      Mic=0x1a

  One problem is that I can't find any model options (options snd-hda-
  intel model=something) or other parameters for the card's model
  (ALC255), I suppose this issue is relatively new.

  /Dennis
  --- 
  ApportVersion: 2.19.2-0ubuntu6
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  dennis     1180 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 16.04
  InstallationDate: Installed on 2015-11-11 (23 days ago)
  InstallationMedia: Ubuntu-GNOME 16.04 LTS "Xenial Xerus" - Alpha amd64 (20151110)
  Package: alsa-driver (not installed)
  ProcVersionSignature: Ubuntu 4.2.0-19.23-generic 4.2.6
  Tags:  xenial
  Uname: Linux 4.2.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm bumblebee cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 09/25/2015
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V1.02
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Aspire VN7-792G
  dmi.board.vendor: Acer
  dmi.board.version: V1.02
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V1.02
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV1.02:bd09/25/2015:svnAcer:pnAspireVN7-792G:pvrV1.02:rvnAcer:rnAspireVN7-792G:rvrV1.02:cvnAcer:ct10:cvrV1.02:
  dmi.product.name: Aspire VN7-792G
  dmi.product.version: V1.02
  dmi.sys.vendor: Acer

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