I have the same problem on a Thinkpad W510 (Nvidia Quadro FX 880M), running the latest nvidia binary drivers from the ubuntu repo.
** Tags added: w510 -- Backlight controls on ThinkPad T510 no longer function when using proprietary drivers https://bugs.launchpad.net/bugs/562005 You received this bug notification because you are a member of Ubuntu-X, which is subscribed to nvidia-graphics-drivers in ubuntu. _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp