Audio via MDP - HDMI not working? OS problem?

I just bought my MacBook Pro a couple of days ago and the model is MC374s/a, im loving it soo far except for one thing. My mdp dosnt send out any audio when using the mdp (with an adapter supporting audio ofc). A friend of mine bought the exact same computer and has the same error.
After reading alot on different forums i came to the conclusion that alot of other people got the same problem. Some of them even sais that their audio was working up until they installed Mac OS 10.6.4 (was working in 10.6.3). Is this a know bug that is going to be patched? Also some people claim that some adapters work (like the griffin) soo is that a solution, go and put up some extra cash and get that one instead? Or might it even be soo that my comp dosnt support audio using the mdp? (Read that some MacBooks dont)
Best regards
/Erik

EXACT same question here!
Please any official of semi-official response is appreciated..

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Moderator edit: Moved post from General Discussion board, changed subject to match question, added system info from duplicate post.

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