5.1 Audio via HDMI

Does the Apple TV support 5.1 audio out via HDMI (either bitstream or PCM)? I have it connected to my Receiver via HDMI (which passes the video to the receivers HDMI out) and I have a few movies from the iTunes store that have 5.1 audio - but the sound is coming out as 2 channels only. Do I need to run the Optical out instead? Is the optical output the only way to get 5.1 audio?
Cheers,
Chris

I think you might be having the same issue I had - essentially there's a handshaking issue between the Apple TV, and the surround sound receiver. The Apple TV will only send the digital signal to the receiver if the receiver and the TV are both switched on before the Apple TV. If you turn things on in the order of:
TV
Receiver
Apple TV (Bring it out of standby)
You should get digital sound! The XBox360 has exactly the same handshaking issue - the same workaround works for the 360 too.

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