MacbookPro select Dolby Surround 5.1 (autosettings)

Hello,
I got the next Problem First i show you my mounting:
MacbookPro -> Thunderbolt->Hdmi Converter. -> Hdmi Cable to my Receiver(Yamaha RX-467) -> Output Hdmi of my Receiver -> To A Benq Beamer
when i do this i can only select the options that my Beamer Requierd Not My Receiver he dont really see the Receiver so i CANT select 5.1
same for my tv if i do this:
MacbookPro -> Thunderbolt->Hdmi Converter. -> Hdmi Cable to my Receiver(Yamaha RX-467) -> Output Hdmi of my Receiver -> To A Philips TV
cant select 5.1 because it doesnt support 5.1 only 2.1
Please help how to select 5.1?

Take 2
I want to know if Logic is a final and complete
solution for Dolby 5.1 productions.
no, it is not. you can do all mixing, balancing, and so on in LP, creating the six mono files, but you need an extra encoder to create the ac3-stream. for example aPack, that is delivered with dvdStudioPro. i always do it with aPack, but there might be other (standalone) solutions.
christian
Quicksilver 2x1G, G4, PB G4 867 Mac OS X (10.4.7) LP 7.1.1, motu 896,M-audio FW410, amt8, unitor8, BCF, BCR, NI all

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