Alright. I've found threads amongst threads about this but none of their solutions have worked for me. The surround sound has worked once in the past but ever since I reinstalled the OS a good while ago I haven't had surround sound out of the HDMI port since. It displays video just fine but when I go into the sound settings it just gives me the option for stereo.
What're some other common things to try to get this to work?
I've disabled all the integrated sound and integrated HDMI stuff in BIOS already as well so everything is solely relying on the ATI 4550 PCIe card.