I am seeing this with my (MSi 1636 based) ZT Elements laptop.  It's
using the Intel Mobile PM965/GM965/GL960 chipset, and Nvidia 8400M G
video card.

For me, the display is changing brightness at the same interval that the
laptop believes it's going onto battery.  This is happening as often as
a couple times a minute.  I can monitor this by the little display
window popping up, and the battery/charging icon on the panel bar.
There are a growing number of similar threads located at the
ubuntuforums site.

I have at least stopped the brightness change by making both the on-ac-
power and on-battery power settings reflect the same battery brightness.
however This only seems to work on certain % of brightness.  Having them
both set to 84% was not working.  I have them both set to 23% bright now
and at least the screen isn't going bright/dim/bright/dim.  This does
not solve the problem, but makes it less annoying.

-- 
brightness control usability issues
https://bugs.launchpad.net/bugs/128452
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