I have a Dell as well with this issue and it is Ubuntu Specific. Fedora works and so does openSuse. It seems to be related to gnome-power-manager because if I close this process I can change my brightness.
I have a Dell as well with this issue and it is Ubuntu Specific. Fedora works and so does openSuse. It seems to be related to gnome-power-manager because if I close this process I can change my brightness.