I was pleased to read news about the new R9 4xx range due to be released in 2016 which will finally include support for HDMI 2.0 and also Displayport 1.3.
I would like to suggest to AMD that they also take the opportunity to add support for HDMI CEC (Consumer Electronics Control). See HDMI - Wikipedia, the free encyclopedia
CEC support requires hardware support so it is not as simple as merely updating the Catalyst drivers.
For what its worth I see there have been previous requests for HDMI CEC support dating back to 2009. See HDMI-CEC | Community
PS. Other than these forums, is there any better method for making suggestions to AMD?