Here's a thread in the linux-thinkpad mailing list about this issue (it affects 
XFCE as well as GNOME):
http://mailman.linux-thinkpad.org/pipermail/linux-thinkpad/2012-February/050576.html

The thinkpad-acpi kernel module maintainer says:
> This typically means broken crap that reacts to brightness *change* events as 
> if they were keypresses. 

Upstream bugs that seem related to this:

- ThinkPad X60s and X300, improper brightness adjustment using function keys 
Fn+{Home,End}, twice long step
  https://bugzilla.gnome.org/show_bug.cgi?id=579224

- Need a setting to tell g-p-m that brightness changes are handled in hardware 
when using xrandr
  https://bugzilla.gnome.org/show_bug.cgi?id=601410


** Bug watch added: GNOME Bug Tracker #579224
   https://bugzilla.gnome.org/show_bug.cgi?id=579224

** Bug watch added: GNOME Bug Tracker #601410
   https://bugzilla.gnome.org/show_bug.cgi?id=601410

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You received this bug notification because you are a member of Ubuntu
Desktop Bugs, which is subscribed to gnome-power-manager in Ubuntu.
https://bugs.launchpad.net/bugs/527157

Title:
  Brightness controls skips Levels.

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https://bugs.launchpad.net/ubuntu/+source/gnome-power-manager/+bug/527157/+subscriptions

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