Public bug reported:

The problem seems to occur when the laptop is running on battery. The
screens brightness varies very quickly up and down in an seemingly
uncontrolled manner (the brightness itself doesn't vary very much, but
enough for the eye to notice). After a few seconds of flickering, the
brightness-level settles, but only to start flickering again a little
later.

1. 'uname -a' :

Linux christian-laptop 2.6.20-15-generic #2 SMP Sun Apr 15 07:36:31 UTC
2007 i686 GNU/Linux

2. 'dmes > dmesg.log' : Resulting file attached

3. 'sudo lspci -vvnn > lspci-vvnn.log' : Resulting file attached

** Affects: Ubuntu
     Importance: Undecided
         Status: Unconfirmed

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Laptopscreens backlight varies when running on battery
https://bugs.launchpad.net/bugs/111464
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