No S/PDIF sound from speakers, headphones OK, Trusty on iMac 14,4

What is the output of:

wget -O alsa-info.sh http://www.alsa-project.org/alsa-info.sh && chmod +x ./alsa-info.sh && ./alsa-info.sh --upload

Thanks

Thanks for prompt response, not sure I've done what you requested but I
the output files are attached:
I'm getting a little out of my depth!
Ed
On 03/08/14 10:07, Ed Hughes wrote:
> New question #252554 on alsa-driver in Ubuntu:
> https://answers.launchpad.net/ubuntu/+source/alsa-driver/+question/252554
>
> No sound from internal speakers but OK from plugged in headphones. Running Xubuntu 14.04 on partitioned iMac 14,4 which has Intel HD Audio (S/PDIF DigitalAudio output). Headphones appear to be using analogue output. Both loud and clear using OSX 10.9.4.
> Have tried all fixes found on many Linux distro websites but no success. Also tried installing Lubuntu (no sound at all) Linux Mint 16 & 17 and Ubuntu 13.04, 13.10 (same problem as Xubuntu).
> Have all PulseAudio utils installed, all devices are listed but only analogue volume meter shows outputs when playing but as above nothing from speakers.
> AlsaMixer shows S/PDIF (highlighted), SPDIF 1 & S/PDIF 2 not MM, set at 00 but cannot be adjusted.
> What is the problem? I sense there is a simple solution here, if only to ger the analogue output via the internal speakers.
> This is reminiscent of problemsI I had with Unbuntu 12.04 on an earlier iMac which were solved simply using AlsaMixer.
> That I have installed Ubuntu on my new iMac shows how much I prefer Linux to OSX, this small problem is spoiling my enjoyment of your great OS.
> Thank you in anticipation.
> Ed Hughes
>

Replying to the automated email and attaching any file doesn't work. All you have to do is copy and paste the text from this website to a terminal (nothing too hard there) and hit ENTER (I'm quite sure you can do that). A URL will be generated, copy and paste that as an update on
https://answers.launchpad.net/ubuntu/+source/alsa-driver/+question/252554

Is copying and pasting text "out of your depth"?

I have the same issue on an iMac 14,2. I think the audio hardware in the iMac 14,2 and 14,4 is probably the same. To get the headphones to work I upgraded to the daily ALSA snapshot found here: https://code.launchpad.net/~ubuntu-audio-dev/+archive/ubuntu/alsa-daily/+packages
Neither the headphones or the internal speakers work with the default configuration so I did this: # echo "options snd-hda-intel model=imac27_122" >> /etc/modprobe.d/imac_local.conf followed by a reboot. This fix works on every other Mac I have tested so far, but for this machine it only fixes the headphone audio. The output of alsa-info.sh is here: http://www.alsa-project.org/db/?f=08cf13552b70232c96fea9293fdd54066243d79a I have downloaded the HDA Analyzer tool but I can't seem to get the internal speakers to work correctly in any consistent way, although they do occasionally work correctly for a few seconds. I can consistently make sound come from the speakers if I chose VREF = 50 or 80 in Node[0x0d]pin but it sounds like I am using a much smaller lower quality speaker when I do that. Here is the text dump for that node configuration:

Node 0x0d [Pin Complex] wcaps 0x41048b: Stereo Amp-In
  Amp-In caps: ofs=0x00, nsteps=0x03, stepsize=0x27, mute=0
  Amp-In vals: [0x00 0x00]
  Pincap 0x00001764: IN Detect Balance
    Vref caps: HIZ 50 GRD 80
  Pin Default 0x400000f0: [N/A] Line Out at Ext N/A
    Conn = Unknown, Color = Unknown
    DefAssociation = 0xf, Sequence = 0x0
  Unsolicited: tag=0x00, enabled=0
  Power: setting=D0, actual=D0
  Delay: 1 samples

The audio related parts of the output of # sudo lspci -vvnn is:

00:1b.0 Audio device [0403]: Intel Corporation 8 Series/C220 Series Chipset High Definition Audio Controller [8086:8c20] (rev 05)
 Subsystem: Intel Corporation Device [8086:7270]
 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: 0, Cache Line Size: 256 bytes
 Interrupt: pin A routed to IRQ 51
 Region 0: Memory at b1c10000 (64-bit, non-prefetchable) [size=16K]
 Capabilities: [50] Power Management version 2
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
  Address: 00000000fee003f8 Data: 0000
 Capabilities: [70] Express (v1) Root Complex Integrated Endpoint, MSI 00
  DevCap: MaxPayload 128 bytes, PhantFunc 0
   ExtTag- RBE-
  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
   RlxdOrd- ExtTag- PhantFunc- AuxPwr- NoSnoop-
   MaxPayload 128 bytes, MaxReadReq 128 bytes
  DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr+ TransPend-
 Capabilities: [100 v1] Virtual Channel
  Caps: LPEVC=0 RefClk=100ns PATEntryBits=1
  Arb: Fixed- WRR32- WRR64- WRR128-
  Ctrl: ArbSelect=Fixed
  Status: InProgress-
  VC0: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
   Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
   Ctrl: Enable+ ID=0 ArbSelect=Fixed TC/VC=01
   Status: NegoPending- InProgress-
  VC1: Caps: PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
   Arb: Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
   Ctrl: Enable+ ID=2 ArbSelect=Fixed TC/VC=04
   Status: NegoPending- InProgress-
 Kernel driver in use: snd_hda_intel

01:00.1 Audio device [0403]: NVIDIA Corporation GK104 HDMI Audio Controller [10de:0e0a] (rev a1)
 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: 0, Cache Line Size: 256 bytes
 Interrupt: pin B routed to IRQ 17
 Region 0: Memory at b1080000 (32-bit, non-prefetchable) [size=16K]
 Capabilities: [60] Power Management version 3
  Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [68] MSI: Enable- Count=1/1 Maskable- 64bit+
  Address: 0000000000000000 Data: 0000
 Capabilities: [78] Express (v2) Endpoint, MSI 00
  DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s unlimited, L1 <64us
   ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
  DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
   RlxdOrd+ ExtTag+ PhantFunc- AuxPwr- NoSnoop+
   MaxPayload 256 bytes, MaxReadReq 512 bytes
  DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
  LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit Latency L0s <512ns, L1 <4us
   ClockPM+ Surprise- LLActRep- BwNot-
  LnkCtl: ASPM L0s L1 Enabled; RCB 64 bytes Disabled- CommClk+
   ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
  LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
  DevCap2: Completion Timeout: Range AB, TimeoutDis+, LTR-, OBFF Not Supported
  DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-, OBFF Disabled
  LnkSta2: Current De-emphasis Level: -3.5dB, EqualizationComplete+, EqualizationPhase1+
    EqualizationPhase2+, EqualizationPhase3+, LinkEqualizationRequest+
 Kernel driver in use: snd_hda_intel