Looks like this functionality is even more broken than I thought.  Upon
disabling and re-enabling "reduce backlight brightness" in the "On
Battery Power" tab of Power Management Preferences, I'm receiving a
whole host of funny effects when I try and change my brightness manually
with the fn keys.  It looks as if the power management subsystem is
bogged down or running extremely slowly.  Changes to the brightness are
not immediately applied and the brightness will sometimes change long
after I've pressed any keys.  Further, the applet displays an empty
battery icon saying that it could not read the status of the battery for
long stretches of time.  Eventually, it will show the proper status, but
only one or two minutes after the power state has changed, and even then
it is not reliable.  Currently, my laptop reads that it is plugged in
when it is not, and it is set to minimum brightness.

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Laptop LCD Brightness steadily decreases with power status change
https://bugs.launchpad.net/bugs/206228
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