CEC not working at boot on Panasonic Viera

[siklosi]

I have Philips TV and after days of trying to figure whats happening I found on Philips support forum that there is known incompatibility problem with different versions of cec versions and my Cable STB was making all the mess. When I disconnected it from TV all started working. When STB was connected there was usual communication with rpi (cec-client dumps everything when changing source etc..) but there were no commands from remote even in cec-client. As soon as I disconnected STB everything started working again. There is solution to cut wire that goes to pin 13 on HDMI cable that goes to STB and Ill do it (my STB doesn't use any of CEC functions). Maybe this will help someone.