I'm having the same issue. My Samsung television will no longer wake up/turn on with the AppleTV remote. This function was working before and just seems to have suddenly stopped. Both devices are currently up to date and have all necessary options " Anynet+"(Samsung) and " Control Tv and Recievers" (Apple) and no luck. Additionally I have reset both devices and have also had no luck. I have also replaced the HDMI to a new one that does support CEC and no luck either. However, when I unplug the Samsung tv and plug it back after 15 minutes , the AppleTV remote does turn on and off the Samsung tv, but will only do it 1 or 2 times and then go back to not working again. I've spoken to Apple support and the advisor was not able to help me and instructed that HDMI CEC is a hit or miss and they cannot control that. It's such a headache because this function DID work before and now seems to have stopped working out of nowhere. One possible solution I did find, is that the AppleTV allows you add third party remotes, and I've added my Samsung tv remote to function on my AppleTV, but it does not work perfectly. Most buttons seem to work volume, menu, home and the directional buttons;however, using the select/okay button will make the window on the Samsung tv that shows you what output you're currently on display every time. And turning on both devices with the one remote doesn't work either. To do this go through the AppleTV Settings > Remotes and Devices and select Learn Remote. Hopefully this issue will get resolved soon, but so far I have not been able to come up with an adequate solution.
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