Which hardware and software release of the C90 do you use? I never tried it but if apple tv sends out HDCP I would expect it not to work. No sound on DVI is correct, as its not supoprted, not sure if the maximum bitrate is different in combination of the AppleTV and the C90 using HDMI vs. DVI. Guess there should be more people who tried to hook up an Apple TV. If you do not get a better answer (and its a non hdmi source) and you have a valid service contract, consider to escalate this thread as a service request to Cisco TAC.
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