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 Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/999888 Title: Missing brightness control in System Settings/Brightness and Lock Status in “gnome-control-center” package in Ubuntu: Confirmed Bug description: There is something missing in the brightness and lock and i can not controll the brightnes. zafer@zafer-G41MT-S2:~$ lsb_release -rd Description: Ubuntu 12.04 LTS Release: 12.04 Desktop version updaed from 11.10 to 12.04 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/999888/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
