I actually experienced the exact same issue with my Windows 8 install on an ASRock CoreHT 252B Mini PC, which acts as my HTPC. Probably the same or similar as you, I'm outputting both video and audio ...

The HDMI Forum, an industry organization that formulates HDMI standards and manages licenses, has refused AMD's request to disclose HDMI 2.1 specifications to open source driver development projects.

The HDMI Forum is the organization responsible for the HDMI standard, recently rejecting AMD's request for public access -- open-source level -- HDMI 2.1 functionality. AMD has had issues with Linux ...

Any Linux user trying to send the highest-resolution images to a display at the fastest frame rate is out of luck for the foreseeable future, at least when it comes to an HDMI connection. The ...

A new workaround has cropped up in Nvidia's latest drivers for Kepler GPUs that allows the cards to output to 4K TV displays at 4K@60Hz over HDMI 1.4. This is instead of the 4K@30Hz that they were ...