I am running windows 8.1 with a R9 280x and I am unable to get surround sound to work using my hdmi. I am sending it to a TV then thru an ARC HDMI to a soundbar. All other devices, xbox etc, can be plugged into the same hdmi port on the tv and the 5.1 works with my surround sound soundbar set up. Only the PC won't output in 5.1. It says in the AMD High Definition Audio Device properties that the only audio format currently supported is 2 channels. Nowhere will it allow me to choose 5.1. I have all current drivers for windows and AMD. I also have a HDMI audio extractor which has a 5.1 switch on it. I turn that on and no change on the PC. I have spent many hours trying to figure this out and nothing worked.
Any help would be greatly appreciated. Thanks