Just read this thing has HDMI-CEC so I went looking. Mine’s an LG TV and it’s called SimpLink on there so I turned that on. Now when I turn on my ATV, the telly also turns on. I’ve also set it to control the volume on my AV receiver. When I put the ATV to sleep it turns my TV off too.
Shame I have to keep my AV receiver on all the time though. I bet if it was a HDMI receiver it’d turn on and off itself too.
95% of my viewing is on ATV so with the need to use the siri remote this makes life very simple.