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Is there a way to set a hotkey to change screen brightness?

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linux-howto

http://askubuntu.com – The brightness keys on my laptop are not recognized by Ubuntu, which is a common problem for a variety of laptops, is there a way to set an arbitrary key shortcut to change brightness in Ubuntu 12.04? I looked in the Keyboard settings app under the shortcut tab, and I couldn't find one. I am able to set brightness in the Brightness and Lock settings app, but it would be much more convenient if I could just assign a key shortcut, like Ctrl-F2 and Ctrl-F3. (HowTos)