What version of DirectX are you running, and where did you get it?
I've seen something similar once, the problem was that the game was taking control of the keyboard and mouse and there was no notification that any activity was taking place, so the power save cut in. Of course, even then moving the mouse/pressing keys was still intercepted by the game so it wouldn't come out of powersave.
That was in a specific game, so assuming the same thing happens with more than one game it seems likely that either DirectX (or some other piece of activity monitoring software) is causing the problem.
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