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[Dennis Marttinen <dennis.marttinen@xxxxxxxxxxx>]

I've gone through the nodes, now making sure to test each channel
separately, but still nothing. Anything else we could try? I'm pretty
sure the microphone is not in the Realtec ALC255 protocol, but still
connected to the Intel sound card.

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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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