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How to Adjust Screen Brightness - ThinkCentre, ThinkPad. After upgrading an older Lenovo laptop to Windows 10 recently, I ran into a very annoying problem. How to adjust the brightness on the Lenovo laptop the brightness seems to be all the way up high? How To Fix Screen Brightness Problem in Windows 10 3 Fixes - Duration. In Windows 10 Using Regedit FeatureTestControl. Download Now LENOVO G50 SCREEN BRIGHTNESS DRIVER