Question about ATi Drivers and windows power saving features on monitor

[Operandi]

Whenever I run a OpenGL screen saver my monitor will not go in to standby. I'm pretty sure this has something to do with ATi's drivers disabling the feature. Perhaps so your monitor won?t turn off in the middle of a game? As I think I remember disabling it in WinME with RadeonTweaker, which doesn?t support XP and isn?t being developed anymore. So I'm assuming it?s simply a registry key where it can be disabled, correct?