After upgrading 14.10=>15.04 (Kubuntu), some defaults disappeared. Archived Xorg.conf, etc. Reactivated fan control using "Option "CoolBits" "4""
So now, in the NV-Control (Nvidia X Server Settings app) in the Thermal Sensor Information section, it appears but is inactive (greyed out). Yes, I have tried starting it with "kdesudo", "kdesu", "gksu", "sudo", etc.
How to make active please?