I have my Pioneer receiver hooked up to my AMD HD4600 which supports audio output over HDMI. I used to work fine, however, after a recent driver update, it will only output stereo sound. It used to output 5.1 surround sound perfectly.
Windows does not seem to recognize the device as capable of 5.1.
In the past, 5.1 was given as an option in the configuration window, like this:
I can not get it to properly recognize the capabilities of the device. I have tried uninstalling the relevant audio device in device manager, and I have also completely removed and reinstalled the display driver.
Any suggestions would be greatly appreciated.