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 acpi_video0
and intel_backlight
inside the /sys/class/backlight
folder. Now in 13.04 there are dell_backlight
and 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 acpi_video0
and intel_backlight
. So the brightness hotkeys are working for him.