Here is the setup: ATV 4k HDR connects to Denon AVR-E300 receiver. The receiver acts as the "hub" for various devices and then it's "monitor output" is to a Samsung tv. Because the Denon handles the device switching, the tv always stays on HDMI 1. Both the Denon and the Samsung support HDMI-CEC. After reading up on the topic, it seems that clicking a button on the remote should power on the Denon and the TV... but I can't seem to get it to work. If I leave both the Denon and the TV set to HDMI control on ( CEC ), the tv with go black. If it turn HDMI control on the TV off, but leave it enabled on the Denon, the Apple doesn't turn anything on... but it controls the volume on the denon. At this point, I am just confused and am hoping someone can enlighten me on how it should all work.