Also, a note: 
With the recent updates to the kernel 'video' module, gnome-power-manager, and 
the acpi-support scripts, my brightness keys no longer work at the kernel 
level.  Instead, it is left up to the userspace, which renders the system 
unable to change brightness when in console-only mode.  This also means that I 
have to hit the brightness keys 5 times to go between valid brightness levels; 
everything in the middle is entirely off.
I found a workaround for the new behavior: add 'options video 
no_automatic_changes=0' to some /etc/modprobe.d/ file -- this gives me the best 
of both worlds: I get the kernel-level brightness changing with the additional 
gnome OSD.  *
However, either way the brightness applet isn't synced with the hotkey-changed 
brightness.  
I also have the strange behavior when hitting 'down' while at the lowest 
brightness level: the LCD will alternate between low and off, with the OSD 
matching.

* That OSD is partly redundant on my system where I have a small, blue,
BIOS-level OSD in the upper-left corner of the screen; the gnome
brightness OSD is also rather ugly compared to the volume OSD.

-- 
LCD backlight turns off between brightness levels during fades, and when on 
battery or at idle
https://bugs.launchpad.net/bugs/121833
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