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

[Saverio Miroddi]

I have a Skylake system (ASRock Z170 Gaming-ITX/ac) with (x)Ubuntu 16.04.

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 64bit]
    [ 0.181062] pci 0000:00:1f.3: reg 0x20: [mem 0xdf120000-0xdf12ffff 64bit]
    [ 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 /devices/pci0000:00/0000:00:1f.3/sound/card0/input11
    [ 4.186034] input: HDA Intel PCH Rear Mic as /devices/pci0000:00/0000:00:1f.3/sound/card0/input12
    [ 4.186081] input: HDA Intel PCH Line as /devices/pci0000:00/0000:00:1f.3/sound/card0/input13
    [ 4.186135] input: HDA Intel PCH Line Out as /devices/pci0000:00/0000:00:1f.3/sound/card0/input14
    [ 4.186188] input: HDA Intel PCH Front Headphone as /devices/pci0000:00/0000:00:1f.3/sound/card0/input15
    [ 4.186228] input: HDA Intel PCH HDMI/DP,pcm=3 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input16
    [ 4.186267] input: HDA Intel PCH HDMI/DP,pcm=7 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input17
    [ 4.186304] input: HDA Intel PCH HDMI/DP,pcm=8 as /devices/pci0000:00/0000:00:1f.3/sound/card0/input18

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
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /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 (20160420.1)
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)
dmi.bios.date: 09/30/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P7.10
dmi.board.name: 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.modalias: 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.:
dmi.product.name: 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.

[Saverio Miroddi (64kramsystem)]

Further information:

    ~$ grep "Codec:" /proc/asound/card*/codec*
    /proc/asound/card0/codec#0:Codec: Realtek ALC1150
    /proc/asound/card0/codec#2:Codec: Intel Skylake HDMI

[Luke Yelavich (themuso)]

You could try upgrading ALSA drivers, instructions here: https://wiki.ubuntu.com/Audio/UpgradingAlsa/DKMS.

[Saverio Miroddi (64kramsystem)]

Thanks, I will try that.

For reference, audio via analog port works fine (it uses the correct profile, `Analog Stereo Output`, which is the same which is inappropriately used when plugging the digital cable).

[Saverio Miroddi (64kramsystem)]

This is fixed by upgrading the kernel to 4.10.

[Ubfan (ubfan1)]

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.

[Saverio Miroddi (64kramsystem)]

Works on 18.04, closing.