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How to change fedora brightness on lenovo notebook ?

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http://www.linuxquestions.org – I am using lenovo notebook with Fedora 13 installed on. It is too bright on fedora platform. I can change brightness on windows by pressing "Fn+ brightness key" , but it does not work on fedora. When I pressed the key, a window shows the brightness bar is reducing. But the screen did not change brightness . System get the key, but did not deal the brightness. Help , does anyone can deal the problem ? (HowTos)