I have my very old Panasonic home cinema (Samsung HT-C5500) plugged into my TV (Samsung UE556530) on HDMI 2 (CEC) and the Aura plugged into one of the HDMI inputs on the Home Cinema.
I tend to turn on the home cinema first which then turns on the TV and Aura and when I click the small power button on the remote which controls the TV it will turn everything off.
I have HDMI Control ON and the Power Off Control set to All.
Also, I have a daily programme reminder set at 5PM to BBC1 HD to ensure the Aura is fully awake and guide populated.