I am running Ubuntu 12.04 LTS on new Acer Aspire V5. There is no other OS installed. I can not control the brightness of the screen using Fn+left and Fn+right keys. I tried to change brightness from "Brightness and Lock" settings, bit still it does not work. Brightness control bar moves, but brightness does not actually change.
Other people have modified the file /etc/default/grub for other Acer models. But that solution does not work for me.
Any advise will be of much help. Thank you.