I have this exact same issue with my Samsung TV and Denon AVR X2500h Receiver. CEC controls are on for both. TV will power off the receiver and adjust volume without issue. However, the TV does not "always" turn on the receiver, I say this because there have been a few times where after 30-45 seconds of waiting, the Receiver does power on, but this doesn't happen 100% of the time. As soon as I go into settings and change the audio source from TV to the receiver, the receiver immediately powers on.
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