It just depends on how the devices interact with each other using HDMI-CEC. Generally it works for powering OFF the devices but not so much powering them on. You may want to consider using a smart power strip.
http://www.amazon.com/Smart-Strip-Protector-Autoswitching-Technology/dp/B0006PUDQK
http://www.amazon.com/Smart-Strip-Protector-Autoswitching-Technology/dp/B0006PUDQK



























