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[Peter Hewett <peter.hewett@xxxxxxxxx>]

Similar symptoms here; audio over HDMI worked fine until update yesterday.

Hardware: Intel NUC D34010WYK
CPU: i3-4010U
Firmware:  WYLPT10H.86A.0038.2015.0410.1634

Software: Kubuntu 15.04
Kernel:    3.19.0-18-generic
Architecture:      x86_64
Processor:         x86_64
SMP Enabled:       Yes

ALSA
Driver version:     k3.19.0-18-generic
Library version:    1.0.28
Utilities version:  1.0.28

Loaded ALSA modules: snd_hda_intel

Also reported at Ubuntu forum.
http://ubuntuforums.org/showthread.php?t=2279520

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Packages, which is subscribed to alsa-driver in Ubuntu.
https://bugs.launchpad.net/bugs/1458301

Title:
  No more HDMI audio output visible/working snd_hda_intel Cannot turn on
  display power on i915

Status in alsa-driver package in Ubuntu:
  Incomplete

Bug description:
  All of a sudden, I believe as a result of a kernel upgrade, I cannot
  play sound via my HDMI output (television). The option is not listed
  anymore in sound settings or VLC. Video output on hdmi works fine. The
  internal speakers work fine as well.

  I have lenovo ideapad u330p.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: alsa-base 1.0.25+dfsg-0ubuntu4
  ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
  Uname: Linux 3.19.0-18-generic x86_64
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0c:   david      1478 F...m pulseaudio
   /dev/snd/controlC1:  david      1478 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Sun May 24 10:48:56 2015
  InstallationDate: Installed on 2014-09-18 (248 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Alpha amd64 (20140917)
  PackageArchitecture: all
  SourcePackage: alsa-driver
  Symptom: audio
  Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
  Symptom_Card: Built-in Audio - HDA Intel PCH
  Symptom_PulsePlaybackTest: PulseAudio playback test successful
  Symptom_Type: Only some of outputs are working
  Title: [HDA-Intel - HDA Intel PCH, playback] Playback problem
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 03/20/2014
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7CCN35WW
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Cherry 3A
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Defined
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: IdeaPad U330p
  dmi.modalias: dmi:bvnLENOVO:bvr7CCN35WW:bd03/20/2014:svnLENOVO:pn20267:pvrIdeaPadU330p:rvnLENOVO:rnCherry3A:rvrNotDefined:cvnLENOVO:ct10:cvrIdeaPadU330p:
  dmi.product.name: 20267
  dmi.product.version: IdeaPad U330p
  dmi.sys.vendor: LENOVO

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