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The screen brightness controls on my Lenovo Ideapad Y500 have stopped working. The controls frequently used are Fn + Up and Down Arrow keys. The other controls are in Settings/Power Options where there's a slider control for Brightness for each power plan; these have also ceased to have any effect when moved.
OS: Windows 10 Home v.1803 build 17134.345. It's a System Image which I recently restored when a recent Windows update caused the laptop to behave erratically. As far as i can recall there was never an issue with these controls back when the System Image was created in January 2018.
Can anyone suggest how to fix the screen brightness controls, please?

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