DTS and DD5.1 can be send trough digitalout in difrent kind of ways, but each reciever supports only some of them.
For example the data can be send 'Wrapped' of 'Padded', when your setup is to send it 'Wrapped' but your reciever doesnt support that, you wont hear a thing.
Seems there can be lots of reasons why Spdiff passtrough doesnt work, you do get stereo/analog sound over digitalout? and then when you play DD5.1/DTS you here nothing, or do you just get 2.0 on the reciever?
Try to play with the settings, but again, i dont own a Optical-Out system yet with linux on it so i never tried it.. will get a n630i board soon too.. so then I will face the same problem i guess
Only thing i know is after i played with the settings for a long time in AC3Filter i finally got it to work.. 
Let us know if you get any further.. think more people own this board or are planning to.

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