After having installed the proprietary Nvidia driver on Debian Jessie in order to play Steam games (which I now can), I can't change the brightness at all, it is stuck at the maximum and is irritating my eyes at night. I have already tried all of the solutions in the Debian wiki
such as adding the line:
Option "RegistryDwords" "EnableBrightnessControl=1;" to
but that has not worked, even though in the Debian forums it seems to work (marked solved):
xbacklight does not work at all, and I don't know what to do anymore. I will post any outputs for whatever terminal commands, please help.