Surround sound modes grayed out

I have attached my mac mini duo to my surround receiver using an optical cable; however i can't set the output to anything but stereo (even in the multi speaker setup).. all surround modes are grayed out (also after reboots and fresh boots)..
Surround work just fine with my dvd players and xbox 360 but the macmini refuses!!! Please please please, anyone have a sollution? Surround is needed! :}
Mac Mini Duo   Mac OS X (10.4.5)   1gb ram, 100Gb hd

I'm pretty much having the same problems. I have the optical jack plugged into my home theater receiver. When I play DVD's encoded in 5.1, I am still getting a PCM signal (2 channel). I go to Disc Setup but the audio options are greyed out. I don't get it. I thought the mini would send out the raw signal and then my receiver would decode what it gets.
I don't really want to use a third party app just to get 5.1 from DVDs. This is a major reason I even bought a mini...

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