I am having lenovo loq with windows 11 ,i recently update my windows and cant adjust my brightness in any way

[Windows 11]

I am having Lenovo Loq with Windows 11. I recently updated my windows and can't adjust my brightness in any way; brightness is on 100% and I can't decrease it, and also my PC runs slower than before and every program that I want to run for the first time after updating. It takes a long time to run, but once it does, it functions normally.

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