Public bug reported:

Binary package hint: gnome-power-manager

I have a P35 Laptop and everytime after each restart the monitor starts
to jitter and  I have no brightness control also the problem shows up
after five-ten minutes.

I can see the brightness control box but it seems frozen. The brighntess
of the monitor goes endless up and down with no user control and the
monitor jitters

the brightness control with "fn" button doesn't work.

only solution I found was to kill the gnome-power-manager - then I have control 
over brightness back and
the "fn" button works again

version installed: gnome power manager 2.20.0-0ubuntu3

** Affects: gnome-power-manager (Ubuntu)
     Importance: Undecided
         Status: New

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gnome-power-manager brightness control is crazy
https://bugs.launchpad.net/bugs/150086
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