After a fresh install of Ubuntu, I discovered the function keys for screen brightness control (Fn+F4 and Fn+F5 in that case) are not functioning. Digging around here, I managed to get them to work by ...
I have installed ironhide using ppa [11.10 - 32 bit, Dell xps 15]. After rebooting I tried to disable nvidia gpu using the command "sudo ironhide-disablecard". I got message as "ERROR : no module for ...