Nvidia Displayport audio card not detected

[Zordid]

Up to Ubuntu 12.10 my Displayport audio output was listed in the available audio devices section of the audio settings - with the update to 13.04 it's simply gone.
I have tried the tested Nvidia graphics driver, it's not there.

ProblemType: Bug
DistroRelease: Ubuntu 13.04
Package: alsa-base 1.0.25+dfsg-0ubuntu4
ProcVersionSignature: Ubuntu 3.8.0-19.29-generic 3.8.8
Uname: Linux 3.8.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 2.9.2-0ubuntu8
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: zordid 2451 F.... pulseaudio
 /dev/snd/pcmC0D0c: zordid 2451 F...m pulseaudio
Date: Thu May 2 20:14:14 2013
InstallationDate: Installed on 2011-10-15 (564 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
PackageArchitecture: all
SourcePackage: alsa-driver
Symptom: audio
Title: PCI/internal sound card not detected
UpgradeStatus: Upgraded to raring on 2013-04-28 (3 days ago)
dmi.bios.date: 09/07/2012
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A19
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: 03RG89
dmi.board.vendor: Dell Inc.
dmi.board.version: FAB1
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA19:bd09/07/2012:svnDellInc.:pnDellSystemXPSL702X:pvr:rvnDellInc.:rn03RG89:rvrFAB1:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: Dell System XPS L702X
dmi.sys.vendor: Dell Inc.

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Eugene (yapsuper)]

This is affecting me I believe, but with new distros. In 14.04 LTS I had audio (and I can't remember if I had to play around with stuff to get it working), but when I upgraded to 16.04 LTS it no longer showed up.

I have a Nvidia GTX 970 and the hdmi port connected to my TV has sound, but the display port connected to my Dell U3416W monitor does not work.