Screen brightness not working after updating windows 10

My Lenovo g50-70 laptop screen brightness button not working and I also not able to adjust brightness of my laptop.it is fixed at maximum level after updating windows 10. Find a solution for this problem.

I have the same problem with my HP Pavilion 17-e073ed notebook. As far as I can tell everything seems to be working again BUT the brightness function keys.
I tried downloading a few of the quick key drivers but they're still not working.

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