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[Matthew Nuzum <matthew.nuzum@xxxxxxxxxxxxx>]

This bug also affects me on my Dell Latitude D430 running Lucid as of
Feb 22 2010.

When I'm working I set brightness to 100%. Using the keyboard shortcuts
there are 8 possible values of brightness: 0% (progress bar gone) to
100% (progress bar full) with 6 steps in between.

If I set brightness to 100% and then let the computer go idle while on
battery it dims to a very low level. Then when I use the computer I
expect that the brightness will go to 100% again but instead it goes to
the fourth step (three above 0). I have to press the brighten keyboard
shortcut four times to get the screen back to 100% brightness.

I do not have an option for ambient light in the gnome power manager
(but I do have an ambient light sensor). Covering the sensor seems to
affect how many times I have to use the keyboard shortcut to get back to
100% brightness. Doing a quick test, with the ambient light sensor
covered I had to use the keyboard shortcut 8 times to get to full
brightness.

-- 
[Jaunty] Original screen brightness not restored after activity with "dim display when idle" for MacBook 5.1 when running on battery.
https://bugs.launchpad.net/bugs/360177
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Status in Mactel Support: New
Status in “gnome-power-manager” package in Ubuntu: Invalid

Bug description:
In GNOME Power Management Settings, one can set "Dim display when idle". When this option is checked, and the user allows for a period of inactivity, the screen will dim. When running on battery, however, after user activity (e.g., input from the keyboard, touchpad, or other input device), the screen is not restored to its original brightness state, but instead remains dimmed.

Bug #357107 and this bug may be related, since this may have to do with storage of brightness settings.