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[AntAgna <AntoineW@xxxxxxxxxxxx>]

I am also experiencing this problem.
Ubuntu 15.04
MSI ProBox23 (Intel H81 chipset)
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)

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https://bugs.launchpad.net/bugs/1453447

Title:
  [Vivid] kernel 3.19.0-17 fails to show HDMI sound output

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  I plug in HDMI through a mini DP adapter. Thus I should see internal
  speakers and HDMI outputs in Gnome control center but I can only see
  internal speakers. It's clearly a kernel issue since switching back to
  3.19.0-16 solves this bug. I did no kernel tweaks. TLP is installed
  though.

  ---
  ApportVersion: 2.17.2-0ubuntu1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  ft         1770 F.... pulseaudio
  CurrentDesktop: GNOME
  DistroRelease: Ubuntu 15.04
  HibernationDevice: RESUME=UUID=54b265b9-4433-42d4-8d0f-fac028ee7030
  InstallationDate: Installed on 2014-03-05 (430 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04 "Trusty Tahr" - Alpha amd64 (20140226)
  Lsusb:
   Bus 003 Device 002: ID 8087:8000 Intel Corp.
   Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: LENOVO 20AQCTO1WW
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-17-generic.efi.signed root=UUID=b1cbc034-b66f-4f6c-9d61-507b8cb23ffe ro quiet
  ProcVersionSignature: Ubuntu 3.19.0-17.17-generic 3.19.6
  RelatedPackageVersions:
   linux-restricted-modules-3.19.0-17-generic N/A
   linux-backports-modules-3.19.0-17-generic  N/A
   linux-firmware                             1.143
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  vivid
  Uname: Linux 3.19.0-17-generic x86_64
  UpgradeStatus: Upgraded to vivid on 2015-01-07 (121 days ago)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 03/09/2015
  dmi.bios.vendor: LENOVO
  dmi.bios.version: GJET83WW (2.33 )
  dmi.board.asset.tag: Not Available
  dmi.board.name: 20AQCTO1WW
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98405 STD
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvrGJET83WW(2.33):bd03/09/2015:svnLENOVO:pn20AQCTO1WW:pvrThinkPadT440s:rvnLENOVO:rn20AQCTO1WW:rvr0B98405STD:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 20AQCTO1WW
  dmi.product.version: ThinkPad T440s
  dmi.sys.vendor: LENOVO

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