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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.

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In the past, 5.1 was given as an option in the configuration window, like this: enter image description here

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.

Thanks

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"after a recent driver update" - That's one of the pitfalls of updating drivers/software w/o the purpose of fixing a specific issue. The technical term is regression, the reappearance of a previously fixed bug or the loss of a feature. If the driver(s) cannot be rolled back, then what I've done is either reinstall the whole OS and inhibit the driver update(s), or live with it & just wait for another driver update with the fix. I've been burned several times by Nvidia "updates", as recnetly as 2 weeks ago in Win8. –  sawdust Apr 15 '12 at 22:12
    
I suppose I can live with it. It just bothers me not using everything to it's full potential. –  Chris A Apr 16 '12 at 1:08
    
In the Any suggestions catagory, many of the methods for multi channel seperations are via "licenced" technologies DTS THX Dolby etc. In some driver updates I get for my audio card, only the original disk holds the "licenced" technologies. The publicly releaced driver updates did not contain them. I assume that we are paying for these technologies when purchacing a product with them in it, and they have rules for distributions. –  Psycogeek Apr 16 '12 at 2:15
    
That or it is just some "filter" item that got broken along the way, some "codec" thing that changed or 101 other things that can happen. –  Psycogeek Apr 16 '12 at 2:23
    
I haven't been using the driver from the original disk for quite some time now, but good suggestion. –  Chris A Apr 16 '12 at 2:38
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