There was a fix for the no HDMI audio on Raring issue (reported in bug
1169984) in the Raring 3.8.0-22.33 kernel update a while ago.  If you
still have no HDMI audio, and you have an NV84 or NVA3 chip (see
http://nouveau.freedesktop.org/wiki/CodeNames/) this should be fixed in
the upstream 3.10 kernel for the NV84. There is a corresponding patch
for the NVA3 which will be included either in the upstream 3.11 kernel
or the upstream 3.12 kernel.  PPA's of these kernels can/will be found
at http://kernel.ubuntu.com/~kernel-ppa/mainline/ and instructions on
how to install and uninstall them are at
https://wiki.ubuntu.com/Kernel/MainlineBuilds

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https://bugs.launchpad.net/bugs/1170315

Title:
  Sound device not detected on Nvidia card using nouveau driver

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