Originally Posted by skooba
what does that mean?
HDMI CEC is Consumer Electronics Control, which lets devices connected by HDMI communicate with each other and control the other. Every company has it's own name for it (KURO Link from Pioneer, Bravia Syncfrom Sony, Anynet from Samsung, etc...) but they should work together. This would let you use your TV remote also turn on the Blu-ray/Receiver when needed, control the volume or playback on it, etc...
However, volume overlay shouldn't be handled by HDMI CEC, as that's not a control feature. If there is volume overlay in the 1120, that's a function of the Marvell chipset that is adding an OSD overlay to the signal when it's passed through the 1120. I imagine this OSD would remain even if HDMI CEC was disabled on one or both devices, as they shouldn't be related (my current AVR has an OSD and I disable HDMI CEC on it).