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[Bug 1156477] [NEW] laptop brightness keys regression


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In 12.04 LTS and 12.10, the fn+f8 and fn+f9 keys properly adjusted my
Thinkpad T530's display brightness perfectly.

I upgraded to Raring on Mar 17, and the brightness keys no longer work.
The indicator appears but the slider does not slide and the screen
brightness does not change.

The brightness slider on the brightness and lock control panel feels
like it has lost granularity -- but I cannot recall the exact behavior
of the older slider.

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete

** Tags: raring thinkpad
laptop brightness keys regression
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