I also tried to run gnome-control-center with sudo: $ sudo gnome-control-center screen
(gnome-control-center:3122): screen-cc-panel-WARNING **: Error getting brightness: GDBus.Error:org.freedesktop.DBus.Error.UnknownMethod: No such interface `org.gnome.SettingsDaemon.Power.Screen' on object at path /org/gnome/SettingsDaemon/Power -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/999888 Title: Missing brightness control in System Settings/Brightness and Lock To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/999888/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
