Once the Apple TV is installed, simplifying control of the entertainment system is possible with Siri Remote. Both the Apple TV and the Siri Remote are capable of interacting with TVs and other equipment thanks to built-in infrared capabilities and HDMI-CEC compatibility. In other words, you can control the TV volume with the Siri Remote after a few simple steps. Follow these instructions to teach the Apple TV how to pretend it's a third-party remote control.
Setting up volume control
1. If the TV or home theater equipment supports HDMI-CEC, make sure this is enabled on the TV or device2. On the Apple TV navigate to Settings -> Remotes and Devices -> Volume Control
3. Select Auto or TV via IR to automatically connect the Siri Remote, then skip to step 7
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4. If the options in step 3 are not available, the TV does not have HDMI-CEC (or it is not enabled on the TV) and you must select Learn New Device
5. Press the volume up button on your third-party remote, while pointing it directly at Apple TV
6. After the progress bar is complete, repeat step 5 with the volume down button
7. Add a name for the new remote control
8. Now the plus (+) and minus (-) buttons on Siri Remote will control the TV or receiver volume
Setting up power control
Bonus for those with HDMI-CEC devices: the Siri Remote can also be used to automatically turn on the TV and switch to the correct input connected to Apple TV. To control power and input on your TV:
1. On the Apple TV navigate to Settings -> Remotes and Devices -> Turn On Your TV With Your Remote
2. If this option is not available, the TV does not have HDMI-CEC (or it is not enabled on the TV) and you cannot control power with the Siri Remote
NOTE: With the power option enabled, putting the Apple TV to sleep will also turn off the connected TV or home theater system.