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[AntAgna <AntoineW@xxxxxxxxxxxx>]

Thank you for pointing out that my BIOS was outdated.

The device I have is the MSI ProBox23, which is based on a similar board to the H81T1  :
http://www.msi.com/product/desktop/ProBox23.html

The H81T1 and ProBox23 have different BIOS versions (the BIOS upgrade refused the BIOS version for the H81T1).
I upgraded the BIOS from here instead:
http://www.msi.com/support/desktop/ProBox23.html#down-bios&Win7 64

I was running BIOS version A0J.
I have just upgraded to BIOS version A0W (Version E7788IOB V10.0BW-W7)

With the newly upgraded BIOS, the HDMI audio output are still not found
with kernel 3.19.0-18

Here is the requested terminal output (after the BIOS upgrade):
$sudo dmidecode -s bios-version
V10.0BW-W7
$sudo dmidecode -s bios-release-date
03/31/2015


** Changed in: linux (Ubuntu)
       Status: Incomplete => Confirmed

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https://bugs.launchpad.net/bugs/1457697

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

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  After upgrading to 15.04, HDMI is not listed in the audio playback
  devices. Audio works normally if I select an older kernel version.

  Kernel versions that cause problem : 3.19.0-17 and 3.19.0-18
  Kernel version not causing the problem : 3.16.0-38

  Here is the output when listing audio playback devices on 3.19.0-18
  antoine@Salon:~$ aplay -l
  **** Liste des Périphériques Matériels PLAYBACK ****
  carte 1: PCH [HDA Intel PCH], périphérique 0: ALC887-VD Analog [ALC887-VD Analog]
    Sous-périphériques: 1/1
    Sous-périphérique #0: subdevice #0
  antoine@Salon:~$ uname -a
  Linux Salon 3.19.0-18-generic #18-Ubuntu SMP Tue May 19 18:31:35 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

  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: Error: command ['fuser', '-v', '/dev/snd/hwC1D0', '/dev/snd/pcmC1D0c', '/dev/snd/pcmC1D0p', '/dev/snd/by-path', '/dev/snd/controlC1', '/dev/snd/timer', '/dev/snd/seq'] failed with exit code 1:
  CurrentDesktop: Unity
  Date: Thu May 21 19:25:32 2015
  HibernationDevice: RESUME=UUID=a8a7a46c-693f-4d19-86e4-f3f23054d7a4
  InstallationDate: Installed on 2013-11-23 (544 days ago)
  InstallationMedia: This
  JournalErrors: Error: command ['journalctl', '-b', '--priority', 'warning'] failed with exit code 1: No journal files were found.
  MachineType: MSI MS-7799
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=e9c33ba8-b3de-4e30-9cce-3094bd5d1d96 ro quiet splash vt.handoff=7
  PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No PulseAudio daemon running, or not running as session daemon.
  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 2015-05-19 (2 days ago)
  WifiSyslog:

  dmi.bios.date: 03/25/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: V10.0B19
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H81TI (MS-7799)
  dmi.board.vendor: MSI
  dmi.board.version: 2.1
  dmi.chassis.asset.tag: To be filled by O.E.M.
  dmi.chassis.type: 3
  dmi.chassis.vendor: MSI
  dmi.chassis.version: 2.1
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrV10.0B19:bd03/25/2014:svnMSI:pnMS-7799:pvr2.1:rvnMSI:rnH81TI(MS-7799):rvr2.1:cvnMSI:ct3:cvr2.1:
  dmi.product.name: MS-7799
  dmi.product.version: 2.1
  dmi.sys.vendor: MSI

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