I am on Ubuntu 18.04.I have gone through an extensive search all night, but couldnt get anything fruitful. Before you tag the question as a duplicate, I firmly urge you to read throughly. My problem is, I can not change my backlight using the GUI slider. I have a system without an integrated GPU, only Nvidia GTX 1070. As I found in some forums (here included), I need to install the latest drivers. I did change to nvidia drivers from xorg ones. Now I cant even see the slider for backlight.
Note: I encountered a solution of an issue resembling mine (involving some changes in xorg.conf), but my gpu is GTX-1070 ,not Quadro.For the link of the solution: Backlight not working on Ubuntu 17.10, Lenovo P51, Xorg, NVIDIA Quadro M1200
