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I have seen many people have had problems with this topic and have tried pretty much every solution I can find (google is an ubuntu users friend) but still have not been able to get audio working through HDMI on my laptop with Ubuntu 14.04 (I also had the same problem with 13.10 and 13.04). Hence why I am writing this ask ubuntu question (my last hope). When I was running Windows 7 this was not an issue.

Laptop Information: 
Graphics: Hybrid Graphics System
GPU/VPU: Intel HD Graphics 3000 and NVIDIA GeForce GT 555M

I am currently running the NVIDIA binary driver - version 331.38 (from additional drivers) I also tried using the Xserver - Nouveau display driver Additionally I installed the oem-audio-hda-daily-dkms (alsa daily builds)

Information: The option for HDMI audio does not show up under sound settings so I installed the pulseaudio manager. However the option for HDMI output is always showing up as (unplugged). I also tried the gnome alsamixer with no luck.

With the alsamixer I can see the option for S/PDIF and even when I unmute it no option appears in the sound settings.

I added the GRUB_CMDLINE_LINUX="" option to the /etc/default/grub just for fun...

I checked all the settings on the TV just to make sure I wasn't missing anything.

I even tried the Bumblebee Project.

Let me know if I need to provide any additional information.

share|improve this question
Nvidia GTX 560Ti, Samsung TV, same situation. After installing and removing VLC phonon backend can't even test HDMI output in KDE settings. 3.13.0-24 – int_ua Apr 29 '14 at 1:21
audio works with nouveau drivers, but they don't see FullHD resolution, just 1280x800 – int_ua Apr 29 '14 at 4:36
It started working again today, check yours please. – int_ua May 9 '14 at 16:09
The audio is not working with the nouveau drivers or the nvidia drivers... I also tried the pavucontrol and the "Digital Surround 5.1 (HDMI) Output" and "Digital Stereo (HDMI) Output" still show up as (unplugged). – user275243 Jun 17 '14 at 3:37

Somehow KDE phonon settings don't show the needed HDMI output. The latest pavucontrol will show much more outputs with addition of plugged in/unplugged prefixes. Just select plugged in one.

share|improve this answer
Thanks. This worked for me. My issue (14.04) was with Nvidia through HDMI. I don't know what exactly I did; I just tinkered with the settings until sound came on. – kelvinilla Aug 1 '14 at 15:02

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