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brightness control doesn't seem to work

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linux-howto

http://askubuntu.com – I have Ubuntu 12.04 LTS on a Toshiba Satellite M115 laptop. The brightness control doesn't seem to work with the "brightness and lock" setting or fn f6 and fn f7 (which usually works in Windows). How can I adjust the brightness and/or access different power settings, so my computer isn't running on full power all the time? (HowTos)