Mini display port surround sound

Hi there.
I've hooked up my 13" macbook pro to my Onkyo av amp using a Cablesson mini display to HDMI adaptor. I'm then into the amp via XO Cables HDMI. In theory everything supports up to 8 channels. When I play a movie though I get stereo. DVD player seems to try playing 5.1 but just sends it to front left and right. Playing a movie in iTunes though plays pink noise if I select the surround sound option but plays stereo fine.
Am i missing something here? feels like it does not support 5.1 but all the specs say it does. Any ideas much appreciated.
John

all sorted. Got to go into Audio Midi set up and oddly select 2ch 24bit. Then it works. Yay!

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