Did you try this fix? http://www.refreshit.info/2012/08/solved-
brightness-increase-and-decrease.html
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https://bugs.launchpad.net/bugs/1072110
Title:
Brightness problem with 12.10
Status changed to 'Confirmed' because the bug affects multiple users.
** Changed in: acpi (Ubuntu)
Status: New = Confirmed
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https://bugs.launchpad.net/bugs/1072110
Title:
