I'm running a Radeon 6950 and using the HDMI audio function and on Windows 7 supported formats it's only showing up to 48kHz and DTS-HD. I'm hooked up to a 7.1 receiver and I'd like to get the full range (DTS-HD MA and 192kHz) but for some reason it's not showing up as supported. I'm running CCC 12.7 beta. Any ideas on what's wrong?
Found the problem. In CCC I have my display hooked up using DVI, with HDMI goign to my receiver. I set the resolution of the HDMI going to receiver as 640x480 because I figured I might as well set it as low as possible since I'm only using it for audio anyways. Once I switched it to 1080p the additional formats opened up. Very strange how that works... Seems like the video resolution shouldn't have an effect on the audio formats supported but, it does.
How graphic card determines what sample rate is supported is actually related to the resolution set on the HDMI display (or AVR). Without going into the HDMI spec, let's just say higher resolution requires higher clocking which high sample rate also requires.
Therefore, the behaviour is not strange after all.