[Inspiron 5559] No sound at all

missing audio output

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-31.50-generic 4.4.13
Uname: Linux 4.4.0-31-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: shaon 3414 F.... pulseaudio
CurrentDesktop: Unity
Date: Sat Apr 8 02:26:22 2017
InstallationDate: Installed on 2017-04-07 (0 days ago)
InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719)
SourcePackage: pulseaudio
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Built-in Audio - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: shaon 3414 F.... pulseaudio
Symptom_Jack: Digital Out, HDMI
Symptom_PulsePlaybackTest: PulseAudio playback test failed
Symptom_Type: No sound at all
Title: [Inspiron 5559, Intel Skylake HDMI, Digital Out, HDMI] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/08/2017
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.2.8
dmi.board.name: 0664DJ
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 10
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.2.8:bd02/08/2017:svnDellInc.:pnInspiron5559:pvr:rvnDellInc.:rn0664DJ:rvrA00:cvnDellInc.:ct10:cvr:
dmi.product.name: Inspiron 5559
dmi.sys.vendor: Dell Inc.