ARC is a minefield of interoperability issues but unless you call both they won't know there is an issue to resolve.
Also, right or wrong the industry is asking everyday consumers to "update the firmware." Frankly I have yet to install a toaster that needed firmware but the day is coming.
I recently upgraded my system with a new TV - the Panasonic TC-P60ST60 - and a new receiver - the Pioneer VSX-1123K. I'm very happy with the performance of both, but am struggling with the ARC feature. I'd like to use the access to Netflix and other streaming services which are built-in to the Panasonic TV. To do that, and get the audio from those apps to play through my speakers, I need to use the Audio Return Channel to send audio back through the HDMI input from my receiver. This works great - my Pioneer gets the signal, switches to the TV input and all is beautiful in Home Theater land.
The problem is, for that to work I must allow the receiver to be controlled by HDMI. If I disable that, ARC no longer works. With that enabled, every time the TV turns on, it sends a power toggle signal to the receiver, which is already on, and that turns it off. Since I use a Harmony 600 remote to turn everything on, the receiver turns on, then the TV, then the receiver turns off. I hit the Help button on the remote, which turns the receiver back on.
So yes, that works, but it's more than a pain, and my family is not crazy about those steps just to watch TV, not to mention how much I may be shortening the life of my receiver by turning it on and off twice every time... Is there anything I can do to remedy this situation?