Public bug reported:

Sorry if this is already reported, there's a lot of brightness bugs on here and 
I can't find this one if it's here.
Using the Jaunty beta on my Samsung NC10.
I've got the gpm set to reduce lcd brightness to 40% when on battery, and also 
to dim the display when idle.
What I expect to happen is for the brightness to be set to 40% 'absolutely' 
when the system is disconnected from AC, reduce further [possibly relative 
reduction] when the system is idle, go back up to the previous brightness when 
brought out of idle state and restore to 100% when plugged back into AC.

What actually happens is that the brightness is changed relatively to the 
current brightness, my brightness changes thusly:
On AC - 100%
Disconnect AC - 40%
Idle - 30%*40% = 12%
Out of idle - 40%*40% = 16%

If this were to continue without me putting the brightness back up to
100%, it would obviously just keep getting darker and darker.

** Affects: ubuntu
     Importance: Undecided
         Status: New

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Brightness decreases perpetually
https://bugs.launchpad.net/bugs/355784
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