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HP Recommended
HP Elitebook 840 G5

While messing in the bios I reset the bios and later when I boot into windows the brightness adjustment function keys didn’t work. I installed windows 11 and it was not fixed, then I reinstalled windows 10 again, the problem persisted. Later, I figured out that all I had to do was go into the

bios > advanced > system options > HP applications driver (enable it).

 

I even made a video explaining the whole thing since it was not actually solved in any community discussion and I for some reason can not reply to them(!)

 

Here is the youtube video in case anyone needs help: 

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