See bug Bug #1755309 for the mismatched prototype in the 4.4 linux
headers for i915_component.h -- preventing building the HDMI audio code.
The 4.10 kernel code finally matched the prototype, and the
intel_audio.c file compiles.

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  Wrong audio profile (on a Skylake system), causing volume problems.

Status in alsa-driver package in Ubuntu:

Bug description:
  I have a Skylake system (ASRock Z170 Gaming-ITX/ac) with (x)Ubuntu

  My speakers are connected via the SPDIF port, but there is a problem.

  When I inspect the audio profile (in `pavucontrol`), I see that `Analog 
Stereo Output (unplugged)` is selected.
  The speakers play regularly, even if this profile is wrong, but the volume 
doesn't work correctly - anything above mute will cause the speakers to play at 
maximum volume.

  If I choose the `Digital Stereo (IEC958)`, the speakers won't receive
  any signal at all.

  Debug info:

  ~$ lspci -vv # extract
      00:1f.3 Audio device: Intel Corporation Sunrise Point-H HD Audio (rev 31)
        Subsystem: ASRock Incorporation Sunrise Point-H HD Audio
        Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- 
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- 
<MAbort- >SERR- <PERR- INTx-
        Latency: 32
        Interrupt: pin A routed to IRQ 140
        Region 0: Memory at df140000 (64-bit, non-prefetchable) [size=16K]
        Region 4: Memory at df120000 (64-bit, non-prefetchable) [size=64K]
        Capabilities: <access denied>
        Kernel driver in use: snd_hda_intel
        Kernel modules: snd_hda_intel

      ~$ dmesg | grep 00:1f.3
      [    0.181004] pci 0000:00:1f.3: [8086:a170] type 00 class 0x040300
      [    0.181034] pci 0000:00:1f.3: reg 0x10: [mem 0xdf140000-0xdf143fff 
      [    0.181062] pci 0000:00:1f.3: reg 0x20: [mem 0xdf120000-0xdf12ffff 
      [    0.181091] pci 0000:00:1f.3: PME# supported from D3hot D3cold
      [    0.181176] pci 0000:00:1f.3: System wakeup disabled by ACPI
      [    0.579846] iommu: Adding device 0000:00:1f.3 to group 8
      [    3.126041] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops 
i915_audio_component_bind_ops [i915_bpo])
      [    4.185983] input: HDA Intel PCH Front Mic as 
      [    4.186034] input: HDA Intel PCH Rear Mic as 
      [    4.186081] input: HDA Intel PCH Line as 
      [    4.186135] input: HDA Intel PCH Line Out as 
      [    4.186188] input: HDA Intel PCH Front Headphone as 
      [    4.186228] input: HDA Intel PCH HDMI/DP,pcm=3 as 
      [    4.186267] input: HDA Intel PCH HDMI/DP,pcm=7 as 
      [    4.186304] input: HDA Intel PCH HDMI/DP,pcm=8 as 

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu5
  ProcVersionSignature: Ubuntu 4.4.0-45.66-generic 4.4.21
  Uname: Linux 4.4.0-45-generic x86_64
  NonfreeKernelModules: zfs zunicode zcommon znvpair zavl wl
  ApportVersion: 2.20.1-0ubuntu2.1
  Architecture: amd64
   /dev/snd/pcmC0D0p:   saverio    3012 F...m pulseaudio
   /dev/snd/controlC0:  saverio    3012 F.... pulseaudio
   /dev/snd/controlC1:  saverio    3012 F.... pulseaudio
  CurrentDesktop: XFCE
  Date: Thu Oct 27 10:21:31 2016
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2016-07-11 (108 days ago)
  InstallationMedia: Xubuntu 16.04 LTS "Xenial Xerus" - Release amd64 
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Microsoft® LifeCam VX-2000 - Microsoft® LifeCam VX-2000
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: None of the above
  Title: [HDA-Intel - HDA Intel PCH, playback] Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install) 09/30/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: P7.10 Z170 Gaming-ITX/ac
  dmi.board.vendor: ASRock
  dmi.chassis.asset.tag: To Be Filled By O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: To Be Filled By O.E.M.
  dmi.chassis.version: To Be Filled By O.E.M.
dmi:bvnAmericanMegatrendsInc.:bvrP7.10:bd09/30/2016:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ170Gaming-ITX/ac:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: To Be Filled By O.E.M.
  dmi.product.version: To Be Filled By O.E.M.
  dmi.sys.vendor: To Be Filled By O.E.M.

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