[PROBLEM] CEC with Optoma beamer and Denon AVR 1910

[afarnedi]

Hi all!
I'm struggling with my remotes to get them working with my raspy PI with Xbian installed.
My problem is I've my Raspy connected to an Optoma beamer HD20 fullhd via Denon AVR 1910 and I can't find the way to get the remote working via CEC; I know Denon supports CEC but I really don't know if I have to use either denon remote or Optoma one (also because I don't know if Optoma has the CEC feature). Rapsy is also connected to a Panny 42 (3 years old model, don't remember the name tho..) always through the Denon; to make the long story short; do I have any chance to get one of these remotes working with raspy?
Obviously CEC is enable in every device excpept for the Optoma in which I can't find any menù or sub menu to switch this feature on.
TIA for your kindly answers.
andrea