[Satellite A500, Nvidia GPU 0a HDMI/DP, Digital Out, HDMI] No sound at all

[ROBERTO]

The external hdmi sound does not work

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: alsa-base 1.0.25+dfsg-0ubuntu5
ProcVersionSignature: Ubuntu 4.10.0-42.46~16.04.1-generic 4.10.17
Uname: Linux 4.10.0-42-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: roberto 1642 F.... pulseaudio
 /dev/snd/pcmC0D0c: roberto 1642 F...m pulseaudio
 /dev/snd/pcmC0D0p: roberto 1642 F...m pulseaudio
 /dev/snd/controlC0: roberto 1642 F.... pulseaudio
CurrentDesktop: Unity
Date: Mon Jan 8 13:20:21 2018
InstallationDate: Installed on 2018-01-07 (1 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:NVidia failed
Symptom_Card: GT216 HDMI Audio Controller - HDA NVidia
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC1: roberto 1642 F.... pulseaudio
 /dev/snd/pcmC0D0c: roberto 1642 F...m pulseaudio
 /dev/snd/pcmC0D0p: roberto 1642 F...m pulseaudio
 /dev/snd/controlC0: roberto 1642 F.... pulseaudio
Symptom_Jack: Digital Out, HDMI
Symptom_Type: No sound at all
Title: [Satellite A500, Nvidia GPU 0a HDMI/DP, Digital Out, HDMI] No sound at all
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 11/24/2011
dmi.bios.vendor: TOSHIBA
dmi.bios.version: V2.00
dmi.board.name: KSKAA
dmi.board.vendor: TOSHIBA
dmi.board.version: 1.00
dmi.chassis.asset.tag: *
dmi.chassis.type: 10
dmi.chassis.vendor: TOSHIBA
dmi.chassis.version: N/A
dmi.modalias: dmi:bvnTOSHIBA:bvrV2.00:bd11/24/2011:svnTOSHIBA:pnSatelliteA500:pvrPSAR3E-00W00FSP:rvnTOSHIBA:rnKSKAA:rvr1.00:cvnTOSHIBA:ct10:cvrN/A:
dmi.product.name: Satellite A500
dmi.product.version: PSAR3E-00W00FSP
dmi.sys.vendor: TOSHIBA
mtime.conffile..etc.modprobe.d.alsa-base.conf: 2018-01-08T13:19:34.538199