"Out of sync and upside down." The Enhance pointer precision checkbox × ScreenRefreshRate ÷ ScreenResolution(DPI). The (incorrect) calculation actually used is: × ScreenResolution(DPI) ÷ MouseBusUpdateRate. The "Enhance pointer precision" code uses a calculation that should have included: Windows mouse handling ("Enhance pointer precision" option) has always been partially broken in Vista and XP due to a simple design error which is only now fixed in Windows 7.
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