[20BXCTO1WW, Intel Broadwell HDMI, Digital Out, HDMI] fails after suspend/resume

[James Ferguson]

HDMI sound works initially (actually I'm using DisplayPort), but after suspend/resume it no longer works.

Based on what I read out there, I tried `pulseaudio --kill; sudo alsa force-reload; pulseaudio --start`, but to no avail.

Happy to debug if there are things I should try.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
Uname: Linux 4.4.0-53-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/pcmC1D0c: james 19076 F...m pulseaudio
 /dev/snd/controlC1: james 19076 F.... pulseaudio
 /dev/snd/controlC0: james 19076 F.... pulseaudio
CurrentDesktop: Unity
Date: Tue Dec 13 21:10:09 2016
EcryptfsInUse: Yes
InstallationDate: Installed on 2016-07-10 (156 days ago)
InstallationMedia: Ubuntu 16.04 LTS "Xenial Xerus" - Release amd64 (20160420.1)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_Card: Built-in Audio - HDA Intel HDMI
Symptom_Jack: Digital Out, HDMI
Symptom_Type: Sound works for a while, then breaks
Title: [20BXCTO1WW, Intel Broadwell HDMI, Digital Out, HDMI] fails after a while
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 01/27/2016
dmi.bios.vendor: LENOVO
dmi.bios.version: JBET56WW (1.21 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BXCTO1WW
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40709 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrJBET56WW(1.21):bd01/27/2016:svnLENOVO:pn20BXCTO1WW:pvrThinkPadT450s:rvnLENOVO:rn20BXCTO1WW:rvrSDK0J40709WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BXCTO1WW
dmi.product.version: ThinkPad T450s
dmi.sys.vendor: LENOVO

[James Ferguson (jamesf)]

I installed the latest upstream kernel for another issue, and found that this issue is resolved by the 4.9 kernel. So I'll add kernel-fixed-upstream tag.

[James Ferguson (jamesf)]

Updated the BIOS to the latest (1.27) with no change to behavior.

$ sudo dmidecode -s bios-version
JBET63WW (1.27 )

$ sudo dmidecode -s bios-release-date
11/10/2016