Thanks for your report. Unfortunately more information is required to assess this.
Is there an option if you go to System > Preferences > Power Management?
What version of Ubuntu are you using?
** Changed in: Ubuntu
Assignee: (unassigned) => Chris Burgan
Status: Unconfirmed => Needs Info
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Cannot change brightness on Toshiba Satellite M45-S331
https://launchpad.net/bugs/76939
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