It is not easy to know if this is a audio driver or video driver
problem, but ways to figure it out include trying:

1) 10.10
2) 10.10 with upgraded alsa drivers according to 
https://wiki.ubuntu.com/Audio/InstallingLinuxAlsaDriverModules (it is 
especially interesting to see if upgrading actually breaks the HDMI audio)
3) 11.04 

And for each of these three, attach an alsainfo according to
http://wiki.ubuntu.com/Audio/AlsaInfo

If there is a difference in the alsa-info data, and that difference in
turn corresponds to when it's broken and when it works, we have
somewhere to start. If not, it's probably a video driver problem.

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https://bugs.launchpad.net/bugs/793592

Title:
  [Studio Hybrid 140g, Realtek ALC888, Black Digital Out, HDMI] No sound
  at all

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