Acer Aspire E5-575G, brightness change is not available on Windows 8.1, how to fix it?

Question

laptops

After installing Windows 8.1, I noticed that I can’t change the brightness, writes that he can’t adjust the brightness on this display, although there were no such problems on a dozen. Many on the net say that they defeated this problem by installing firewood, but I already have firewood for the Nvidia video card, but the problem has not disappeared.

Answer 1

After installing Windows 8.1

mistake number 1. and this is with live Windows 10!!!!
mistake number 2. if it wasn’t ... what for did you change something ????
mistake number 3. everyone has it!!!! version question
mistake number 4. create a problem for yourself and call others to solve it