I have a 37PFL5405 connected to my IPTV box through HDMI 1. CEC works fine but only if I don't have my HTPC connected on HDMI 2 input.

The HTPC is connected through a DVI-HDMI cable : when unplugged, the IPTV box (supplied by my ISP, french company "Free") detects properly the TV as CEC device, but when I plug the DVI-HDMI cable, the CEC device disappear from the IPTV box.

The TV firmware is up-to-date, as well as the IPTV box.

I'd really appreciate some advice.

Best regards,