Dmitriy:  Yes it is a dirty hack :)  I don't know of any other
applications that would increment the backlight up and down, and GNOME's
ability to set the brightness to a specific percentage (without going
through steps inbetween) *should* still be functional with it...although
even the unpatched gnome-settings-daemon in Debian Wheezy doesn't know
how to handle simple things like "dim on battery power" correctly yet so
I can't test that conclusively right now.

I think that your solution might require a patch to the kernel itself.
At least in my case, backlight keypresses are handled by the thinkpad-
acpi module, and I'm guessing non-thinkpad problem laptops use the
kernel's built-in acpi functionality.  I could be wrong though.

Either way, this bug now belongs to gnome-settings-daemon, since all
power-handling functionality has moved over there.  This bug entry
should probably be marked 'Invalid' as you said, and a new bug should be
opened.

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https://bugs.launchpad.net/bugs/527157

Title:
  Brightness controls skips Levels.

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