I tested this in Arch, and it affects Arch's current version as well.
Every version of GPM I've seen seems to have this issue.  Kubuntu's
power manager does not have this problem.  I looked into the code for
GPM, and noticed that xrandr is used to adjust the brightness.  The HAL
code has an option to check an fdi for brightness_in_hardware, but the
xrandr code does not have any similar option.  My C kung-fu is not
sufficient to fix this problem on my own at this time, but I will
continue to work at it.  \

I don't think we want to disable xrandr entirely for this model, since
this would likely break stuff like "dim after a few minutes" or dim on
battery.  Instead, I think there should be an option to disable
brightness up and down events being controlled by xrander, based on
gconf or a setting in GPM.

-- 
Brightness controls skips Levels.
https://bugs.launchpad.net/bugs/527157
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