Thanks David, after reinstalling again, I have tested "Digital Surround
5.1 (HDMI) nr 4 Output" and audio does work (only after installing the
nvidia proprietary driver).

It is good that a user can now configure this via the GUI.  However,
somehow I missed this after selecting a few options.  I had no idea what
"nr 4 Output" meant.  Looking to get an out-of-the-box solution, what
could we do about this?

When I edited the alsa config to limit the available interfaces exposed
to pulseaudio, the drop down box displayed:-

  Digital Stereo (HDMI) Output
  Digital Surround 5.1 (HDMI) Output

Which was perfect and simple.

I think the solution to this lies in alsa.  Unless these other three
outputs have any use, then I think alsa should not expose them.  (If
they do have any other use, I would be interested to know what)

The question is whether it would be technically possible for alsa to
know which interface is valid?

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https://bugs.launchpad.net/bugs/716371

Title:
  Nvidia HDMI - four codecs, which one is the right one?

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