It's been awhile, and my sister is having a problem with adjusting the brightness levels on her 2012-2013 Lenovo IdeaPad P500 laptop. (Yes, I did give her laptop a good thorough cleaning because it had some overheating issues because of dust build-up, and I installed Solus for her. So far she likes it.) I checked it out, and I can still either adjust the brightness under "Power" in the settings or use the buttons on her laptop to adjust it. The bar to show the brightness levels of the screen does pop up, but it doesn't adjust the brightness at all when I tried both options. It seems as though it's either very delayed when I tried it, or it just doesn't do it. Currently, I can't make heads or tails of the problem. Any thoughts and suggestions are greatly appreciated.