I can confirm both the alternating behavior with Fn Up Arrow as well as the not 
restoring full brightness when I swipe across my Dell Latitude D620 trackpad. 
https://answers.launchpad.net/ubuntu/+source/acpi/+question/174296

I think it is in Gnome upstream of Ubuntu as this occurs on Fedora 16 (but not 
F15) Gnome:
http://ask.fedoraproject.org/question/121/laptop-screen-dims-on-f16-unlike-f15
And not on Kubuntu or SuSE 12.1 KDE.

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https://bugs.launchpad.net/bugs/872932

Title:
  Brightness

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