[Bug 1657994] Re: Regression: HDMI audio produces no sound (Skylake NUC)

Ubuntu 16.10 (Yakkety Yak) with kernel 4.8 has reached end of life and
this bug will not be fixed for that specific release. Please file a new
bug if this issue still exists in a supported release.

** Changed in: linux (Ubuntu Yakkety)
Status: Confirmed => Won't Fix

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https://bugs.launchpad.net/bugs/1657994

Title:
Regression: HDMI audio produces no sound (Skylake NUC)

Status in Linux:
Fix Released
Status in linux package in Ubuntu:
Expired
Status in linux source package in Yakkety:
Won't Fix

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
AudioDevicesInUse:
USER PID ACCESS COMMAND
/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 (20160719)
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
RelatedPackageVersions:
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)
dmi.bios.date: 06/03/2016
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: KYSKLi70.86A.0037.2016.0603.1032
dmi.board.name: 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
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrKYSKLi70.86A.0037.2016.0603.1032:bd06/03/2016:svn:pn:pvr:rvnIntelCorporation:rnNUC6i7KYB:rvrH90766-405:cvnIntelCorporation:ct3:cvr1.0:

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