I have a Dell Inspiron N4010 laptop. My brightness hotkeys are not able increase or decrease the brightness of the screen. And as a matter of fact, I also can not reduce the brightness from the
Brightness & Lock menu under
System Settings. Any solutions?
EDIT: I think I may have found the reason behind the problem. In the previous versions of Ubuntu there were
intel_backlight inside the
/sys/class/backlight folder. Now in 13.04 there are
intel_backlight in that folder. And the most interesting part, my friend installed 13.04 on his Dell Vostro and in his system's
/sys/class/backlight folder there are
intel_backlight. So the brightness hotkeys are working for him.