PCI/internal sound card not detected E7470

Sound card not detected with Dell E7470. Tried all different tips found on ubuntu doc and various forums without any success.

Regards

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: alsa-base 1.0.25+dfsg-0ubuntu5
Uname: Linux 4.4.6-040406-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
CurrentDesktop: XFCE
Date: Tue May 3 15:14:14 2016
InstallationDate: Installed on 2016-04-14 (18 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Release amd64 (20151021)
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 02/14/2016
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.3.0
dmi.board.name: 0VNKRJ
dmi.board.vendor: Dell Inc.
dmi.board.version: A02
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvr1.3.0:bd02/14/2016:svnDellInc.:pnLatitudeE7470:pvr:rvnDellInc.:rn0VNKRJ:rvrA02:cvnDellInc.:ct9:cvr:
dmi.product.name: Latitude E7470
dmi.sys.vendor: Dell Inc.