This is a great fix 2.0™. Works flawlessly. I might add that for Windows 10 the instructions differ slightly: Open regedit (type regedit in start menu search box) Navigate to: HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Video Now hit Ctrl+F or select find from the edit menu. Search for: FeatureTestControl You should find two instances of FeatureTestControl, change each instance you find from whatever it currently is to f840 (as hex) or 63808(decimal). Reboot. Now it will stay on 60Hz whether you run on A/C or Battery.