2 things
1/ if you've posted in on the official AMD forums, then yes AMD are aware but you should still report it on the feedback form (thanks for posting that to the thread)
2/ having personally used DVI, VGA and HDMI outputs on A10-7850's and multiple mobo's I dont think this is a widespread issue but I will look into it. The clearer you are on how you produce the problem the better "i.e. on mine can use HDMI and VGA but not DVI" - are you trying to run 3 displays at once or one at a time or two at a time?