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[Jérémie <jitsumi@xxxxxxxxx>]

I also have this bug.
I confirm that in3.19.0-16 I have the HDMI sound, and in  3.19.0-18, nothing.

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https://bugs.launchpad.net/bugs/1457446

Title:
  No HDMI Audio Source on Newer Kernels

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I am also experiencing this problem.
  Ubuntu 15.04

  TV plugged in HDMI port

  Problem happens with Kernel versions 3.19.0-17 and 3.19.0-18

  HDMI audio worked before upgrading from 14.10 to 15.04
  HDMI audio works if I select an older kernel (3.16.0-38)

  No hdmi source seen on newer kernels, not on pavc either.

  ProblemType: Bug
  DistroRelease: Ubuntu 15.04
  Package: linux-image-3.19.0-18-generic 3.19.0-18.18
  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
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  steve      2506 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Thu May 21 06:52:36 2015
  HibernationDevice: RESUME=UUID=0cc21abb-9611-459b-a2f3-d72b38316190
  InstallationDate: Installed on 2014-09-29 (233 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: Acer Aspire S7-392
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic.efi.signed root=UUID=9c0dd135-4539-4895-be0d-25ecc94a9bea ro quiet splash vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-18-generic N/A
   linux-backports-modules-3.19.0-18-generic  N/A
   linux-firmware                             1.143.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-04-27 (23 days ago)
  dmi.bios.date: 05/20/2014
  dmi.bios.vendor: Insyde Corp.
  dmi.bios.version: V2.12
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: Storm2
  dmi.board.vendor: Acer
  dmi.board.version: V2.12
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: Acer
  dmi.chassis.version: V2.12
  dmi.modalias: dmi:bvnInsydeCorp.:bvrV2.12:bd05/20/2014:svnAcer:pnAspireS7-392:pvrV2.12:rvnAcer:rnStorm2:rvrV2.12:cvnAcer:ct10:cvrV2.12:
  dmi.product.name: Aspire S7-392
  dmi.product.version: V2.12
  dmi.sys.vendor: Acer

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