Public bug reported:

Binary package hint: 915resolution

My guess is this is related to the 915resolution package, or that of the
updated kernel.  In Feisty the brightness hardware keys (fn-f1 & fn-f2)
worked fine for adjusting the screen brightness.  Now, recently noticed
in tribe 4 release they do not.

Turning up the brightness effectively brings it to the lowest setting
and won't re-adjust to a higher value (although the meter is displayed
on the screen as usual).

However, if I leave the machine idle for 60 seconds the brightness will
auto-readjust itself to its previous full brightness level.

** Affects: 915resolution (Ubuntu)
     Importance: Undecided
         Status: New

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[gutsy tribe 4] brightness keys no longer work but system automagically updates 
to full brightness after 60 seconds
https://bugs.launchpad.net/bugs/131338
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