I trust you already tried removing all linux-backports-modules-alsa-* packages? 
Specifically, have you tried
a) booting 2.6.32-27 with no alsa-backports installed
b) booting 2.6.32-33 with no alsa-backports installed

If the 2.6.32-28 kernel update didn't come with the corresponding linux-
backports-modules-alsa-$version package, a change in audio behaviour
sounds reasonable.

(Note: always report a bug from the *non*-working kernel so the proper
logfiles get added)

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https://bugs.launchpad.net/bugs/708957

Title:
  no more hdmi audio output

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