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[Arjen <1458478@xxxxxxxxxxxxxxxxxx>]

I have a similar problem. With this kernel my hdmi-audio works just fine:
/boot/vmlinuz-3.19.0-16-generic.efi.signed

With this new one it is not available/recognized:
/boot/vmlinuz-3.19.0-18-generic.efi.signed

In my case its a Intel HDMI device:

On 3.19.0-16 aplay -l shows:
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: HDMI [HDA Intel HDMI], device 3: HDMI 0 [HDMI 0]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 7: HDMI 1 [HDMI 1]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 0: HDMI [HDA Intel HDMI], device 8: HDMI 2 [HDMI 2]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

On 3.19.0-18 it only lists these devices:
$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 1: PCH [HDA Intel PCH], device 0: ALC892 Analog [ALC892 Analog]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
card 1: PCH [HDA Intel PCH], device 1: ALC892 Digital [ALC892 Digital]
  Subdevices: 1/1
  Subdevice #0: subdevice #0

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https://bugs.launchpad.net/bugs/1458478

Title:
  No HDMI audio output on newer kernel (3.19.0-18).

Status in linux package in Ubuntu:
  Confirmed

Bug description:
  No HDMI audio source on newer kernel (3.19.0-18).

  Ubuntu 3.19.0-18.18-generic 3.19.6

  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
  NonfreeKernelModules: nvidia
  ApportVersion: 2.17.2-0ubuntu1.1
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/pcmC1D0p:   jeremie    2472 F...m pulseaudio
   /dev/snd/controlC1:  jeremie    2472 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon May 25 16:46:02 2015
  HibernationDevice: RESUME=UUID=5779ea79-4b37-4599-bd15-e752ed9df0f5
  InstallationDate: Installed on 2015-03-26 (59 days ago)
  InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
  MachineType: Dell Inc. Inspiron 7737
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=d36a6066-c2e5-4657-a02a-bd725006eccc ro quiet splash
  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
  RfKill:
   1: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: yes
  SourcePackage: linux
  UpgradeStatus: Upgraded to vivid on 2015-05-03 (21 days ago)
  dmi.bios.date: 10/31/2013
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: A05
  dmi.board.name: 09MYRM
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Inc.
  dmi.chassis.version: 0.1
  dmi.modalias: dmi:bvnDellInc.:bvrA05:bd10/31/2013:svnDellInc.:pnInspiron7737:pvr:rvnDellInc.:rn09MYRM:rvrA00:cvnDellInc.:ct8:cvr0.1:
  dmi.product.name: Inspiron 7737
  dmi.sys.vendor: Dell Inc.

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