Changing back to new.. and can also add that it still happens even after
the wave of updates that has been coming since my original report. Fully
up-to-date as of right now and after the reboot, the audio was at analog
instead of HDMI.

** Changed in: pulseaudio (Ubuntu)
       Status: Incomplete => New

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https://bugs.launchpad.net/bugs/1299786

Title:
  Sometimes no audio, output changed to S/PDIF

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  Sometimes in 14.04 I don't have any audible sound. Checking volume
  applet > Sound Settings I can see that output is set to S/PDIF. Even
  though the audio previously was through HDMI. Switching it back to
  HDMI makes the sound audible again.

  I have no speakers connected either through analog or S/PDIF. Only
  HDMI.

  After initial install, it was set to HDMI.

  Why does this happen automatically?

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: pulseaudio 1:4.0-0ubuntu10
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  Uname: Linux 3.13.0-19-generic x86_64
  NonfreeKernelModules: nvidia
  ApportVersion: 2.13.3-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  thnov      1875 F.... pulseaudio
   /dev/snd/controlC0:  thnov      1875 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun Mar 30 16:50:57 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-03-28 (2 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  SourcePackage: pulseaudio
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 06/04/2013
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 1302
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: P8H77-M LE
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr1302:bd06/04/2013:svnSystemmanufacturer:pnSystemProductName:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnP8H77-MLE:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: System Product Name
  dmi.product.version: System Version
  dmi.sys.vendor: System manufacturer

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