Setup: RPi B Rev 2 (Archlinux 3.12.20-4) connected to Samsung TV via HDMI. Also connected to the TV is a Samsung Bluray-Player.
Issue: Powering down the RPi disables CEC between TV and BD-Player. That is switching on the BD-Player is not waking up the TV. Commands of the TV (by remote controll) are not transmitted to the BD-Player.
Research: Changing HDMI-Ports on the TV yields no different result. Connecting a HDMI cable to the TV with nothing at the other end seems to be no problem (TV and CEC working fine in this case). As far as I can tell the RPi is all that changes matters here. If the RPi is not powerless (either running or being connected to the power supply) everthing works fine.
I notice the question is close to Pi seems to prevent DVD player from switching on TV automatically but not answered there either.