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Screen brightness keys don't work

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linux-howto

http://askubuntu.com – I read the same problems but I didn't find an answer. I can change my brightness by slider in "brightness and lock" but when I press the key button it goes to lowest level and when I press the other button it just become lighter just one level and I just can switch between this two dark levels. Is there anyway I can repair it without changing it manually? (HowTos)