[XPS 13 9350, Realtek ALC3246, Speaker, Internal] No sound at all from the headphone jack

The problem is that there is no sound at the jack for the headphones.

Internal speaker are silenced when inserted a headphone jack but there is no sound output.
Tested a live MS windows and sound worked!

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: pulseaudio 1:8.0-0ubuntu3.1
ProcVersionSignature: Ubuntu 4.4.0-53.74-generic 4.4.30
Uname: Linux 4.4.0-53-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.2
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jaki 2355 F.... pulseaudio
CurrentDesktop: Unity
Date: Thu Dec 15 12:41:55 2016
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-osp1-20150720-0
InstallationDate: Installed on 2016-06-25 (173 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20150720-04:06
ProcEnviron:
 LANGUAGE=it
 PATH=(custom, no user)
 XDG_RUNTIME_DIR=<set>
 LANG=it_IT.UTF-8
 SHELL=/bin/bash
SourcePackage: pulseaudio
Symptom: audio
Symptom_AlsaPlaybackTest: ALSA playback test through plughw:PCH successful
Symptom_Card: Audio interno - HDA Intel PCH
Symptom_DevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: jaki 2355 F.... pulseaudio
Symptom_Jack: Speaker, Internal
Symptom_PulsePlaybackTest: PulseAudio playback test failed
Symptom_Type: No sound at all
Title: [XPS 13 9350, Realtek ALC3246, Speaker, Internal] No sound at all
UpgradeStatus: Upgraded to xenial on 2016-09-07 (98 days ago)
dmi.bios.date: 06/14/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.4.4
dmi.board.name: 0H67KH
dmi.board.vendor: Dell Inc.
dmi.board.version: A03
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.4.4:bd06/14/2016:svnDellInc.:pnXPS139350:pvr:rvnDellInc.:rn0H67KH:rvrA03:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 13 9350
dmi.sys.vendor: Dell Inc.