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[Ken Norris <981416@xxxxxxxxxxxxxxxxxx>]

Apologies. It's fixed. For me, this was a digital configuration matter
found in the http://www.mythtv.org/wiki/Configuring_Digital_Sound

"If you are feeding the receiver raw audio (PCM), then 'Data: audio' is
correct. However, if you are feeding it an encoded stream (Dolby AC3 or
DTS), 'Data: non-audio' is correct. To change it, type 'iecset audio on'
or 'iecset audio off.'"

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https://bugs.launchpad.net/bugs/981416

Title:
  Passthrough via SPDIF stopped working

Status in “mythtv” package in Ubuntu:
  Confirmed

Bug description:
  Description:	Ubuntu 11.10
  Release:	11.10
  NVidia HDA ALC1200 optical SPDIF digital output. 
  Both DTS and AC3 worked well for months after early, unknown problems getting AC3 through. Upgraded various packages, including Mythtv to 0.25, before this latest problem.
  PCM works via the SPDIF optical cable.
  Attempts to play DTS 5.1 audio results in a 'Dolby Digital 3/2' display on the receiver and no sound. Choosing the PCM option from the same file plays in stereo okay. AC3 audio defaults to PCM (I think).
  The NVidia HDA ALC1200 seems no longer to have a digital 5.1 option when viewed with Pulse audio volume control but shows correctly in Mythtv and aplay -L.

  The receiver (Sony STR-DE835) decodes DTS and AC3 fine from a stand-
  alone DVD player via a coaxial cable.

  I'm well out of my depth here. I apologise if this is a settings
  mistake.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: alsa-base 1.0.24+dfsg-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-17.30-generic-pae 3.0.22
  Uname: Linux 3.0.0-17-generic-pae i686
  NonfreeKernelModules: nvidia
  AlsaVersion: Advanced Linux Sound Architecture Driver Version 1.0.24.
  ApportVersion: 1.23-0ubuntu4
  Architecture: i386
  Card0.Amixer.info:
   Card hw:0 'XFi'/'Creative X-Fi 20K1 Unknown'
     Mixer name	: '20K1'
     Components	: ''
     Controls      : 30
     Simple ctrls  : 11
  Card1.Amixer.info:
   Card hw:1 'NVidia'/'HDA NVidia at 0xcfff0000 irq 20'
     Mixer name	: 'Realtek ALC1200'
     Components	: 'HDA:10ec0888,10de0175,00100101'
     Controls      : 38
     Simple ctrls  : 21
  Card2.Amixer.info:
   Card hw:2 'NVidia_1'/'HDA NVidia at 0xceffc000 irq 16'
     Mixer name	: 'Nvidia GPU 0d HDMI/DP'
     Components	: 'HDA:10de000d,10de0101,00100100'
     Controls      : 16
     Simple ctrls  : 4
  Date: Sat Apr 14 16:19:22 2012
  InstallationMedia: Mythbuntu 11.10 "Oneiric Ocelot" - Release i386 (20111012)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_AU:en
   PATH=(custom, no user)
   LANG=en_AU.UTF-8
   SHELL=/bin/bash
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:NVidia successful
  Symptom_Card: Internal Audio - HDA NVidia
  Symptom_Jack: Black SPDIF Out, Rear
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Only some of outputs are working
  Title: [132-CK-NF78, Realtek ALC1200, Black SPDIF Out, Rear] Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/16/2008
  dmi.bios.vendor: Phoenix Technologies, LTD
  dmi.bios.version: 6.00 PG
  dmi.board.name: 132-CK-NF78
  dmi.board.vendor: EVGA
  dmi.board.version: 2
  dmi.chassis.type: 3
  dmi.chassis.vendor: EVGA
  dmi.chassis.version: 132-CK-NF78
  dmi.modalias: dmi:bvnPhoenixTechnologies,LTD:bvr6.00PG:bd01/16/2008:svnEVGA:pn132-CK-NF78:pvr2:rvnEVGA:rn132-CK-NF78:rvr2:cvnEVGA:ct3:cvr132-CK-NF78:
  dmi.product.name: 132-CK-NF78
  dmi.product.version: 2
  dmi.sys.vendor: EVGA

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