Pedro: Sorry I didn't respond to the earlier message.  It must have
slipped through the cracks.

I think this is a user interface bug, not a hardware bug.  (If it's a
hardware bug, it might be because I've had to do strange things to get
my backlight controls to work...)

Gnome has two brightness settings in System->Preferences->Power
Management.  One is under "On AC Power". The other is under "On Battery
Power".

Steps to reproduce:

1) Set AC to 100%, Battery to 50%.
2) Unplug the AC.  The screen dims, as expected.
3) Click the brightness meter on the panel.  It reads 50%.  Set brightness to 
100% in the applet.  The screen runs at 50% brightness.
4) Click the meter icon a few times.  Each time it redisplays the slider, it 
halves the brightness.

-- 
brightness applet cannot override battery dimming
https://bugs.launchpad.net/bugs/155121
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