Apparently, there are many ways to control the backlight, and while
using the kernel is the default on your hardware, it is possible to
change that with xrandr. Take a look at bug 367309 for how to do this.
Could you check if you have the same weird behavior with the other
settings?

** Tags added: backlight

** Changed in: xserver-xorg-video-intel (Ubuntu)
       Status: Invalid => Confirmed

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[i965] Wierd backlight brightness behaviour looks like flashes on Amilo Si 2636
https://bugs.launchpad.net/bugs/356510
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