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: 3.13.0-24-generic 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 X.org 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="radeon.audio=1" 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.