[ubuntu] Lenovo G450 brighteness control on ubuntu 9.10

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http://ubuntuforums.org – Friends I have lenovo G450 series laptop its brightness can be adjusted using Fn+up arrow and Fn+down arrow this shortcuts where working fine in jaunty but after installing karmic they stopped working,:sad:Please tell me is there any way to make it work in jaunty? Is there any option like reverting to old good jaunty keyboard driver(or is it keyboard layout?? !:confused:!) please solve my issue:smile: (Hardware)