My brightness controls weren't working before, but I didn't really care, but somehow I lowered my screen brightness while downloading league through playonlinux. Now the brightness controls aren't working with the FN keys or in the settings, and its stuck on very low.
I tried this http://itsfoss.com/fix-brightness-ubuntu-1310/, and everything here https://sites.google.com/site/easylinuxtipsproject/display, but they didn't do anything.
I am on a Lenovo Z500 using Intel graphics. I have a Nvidia GeForce GT 635M but don't use it.
I have noticed that there are the folders
/sys/class/backlight/, each with the files
max_brightness. Only in
actual_brightness set to the maximum value. It says, though, that I don't have the permissions to change them with
Workaround: I got brightness back up by using the brightness FN keys outside of Ubuntu (before it starts or in the BIOS settings), but still whenever I press either of the brightness buttons it goes really dim and cannot be changed.