Humaximus – 4 hours ago »
The new Humax YouView unit has HDMI CEC control, though it can be a bit temperamental. It works most of the time with my Samsung TV in that when I switch the Humax YouView unit on, it switches my TV on, and once the Hummy has fully booted up, it then switches the TV to the correct HDMI connection.
Some TV’s will autoswitch on port activity (like a hdmi switch will auto select the last powered on input). I suspect your TV has this option. I doubt if the Youview box actually has CEC.