Do you have any alsa/pulseaudio config?

This can be quickly verified by running "vanilla" Ubuntu.


If both of them work, then it's probably related to your config setting.

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  Regression:  HDMI audio produces no sound (Skylake NUC)

Status in linux package in Ubuntu:
Status in linux source package in Yakkety:

Bug description:
  After upgrade from Xenial 16.04 to Yakkety 16.10, playing audio over HDMI no 
longer produces sound.
  * When booting with old kernel from Xenial (4.4.0-59), HDMI audio works fine
  * Audio from headphone jack works fine
  * Userspace seems to be happily playing to HDMI audio device, but no sound 
produced at HDMI sink (Samsung TV)

  Any of a wide range of pre-built mainline kernels fail to produce HDMI
  audio, but with a different failure mode (HDMI audio does not seem to
  be enumerated in the same way as in the Ubuntu kernels.)

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-4.8.0-34-generic 4.8.0-34.36
  ProcVersionSignature: Ubuntu 4.8.0-34.36-generic 4.8.11
  Uname: Linux 4.8.0-34-generic x86_64
  ApportVersion: 2.20.3-0ubuntu8.2
  Architecture: amd64
   /dev/snd/controlC0:  israel     1973 F.... pulseaudio
   /dev/snd/controlC1:  israel     1973 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Fri Jan 20 08:58:35 2017
  HibernationDevice: RESUME=UUID=ca27f739-071f-4c25-974e-0d0f0614b21c
  InstallationDate: Installed on 2016-10-03 (108 days ago)
  InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.8.0-34-generic.efi.signed 
root=UUID=90c3e094-e890-4c35-a0d2-0a358f5d2430 ro quiet splash vt.handoff=7
   linux-restricted-modules-4.8.0-34-generic N/A
   linux-backports-modules-4.8.0-34-generic  N/A
   linux-firmware                            1.161.1
  SourcePackage: linux
  UpgradeStatus: Upgraded to yakkety on 2017-01-13 (6 days ago) 06/03/2016
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: KYSKLi70.86A.0037.2016.0603.1032 NUC6i7KYB
  dmi.board.vendor: Intel Corporation
  dmi.board.version: H90766-405
  dmi.chassis.type: 3
  dmi.chassis.vendor: Intel Corporation
  dmi.chassis.version: 1.0

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