Public bug reported:

Version of Ubuntu: jaunty (Beta)
Version of gnome-power-manager: 2.24.2-2ubuntu7
Hardware: Dell Inspiron mini 9
Last known working version: Intrepid

When I hit the brightness down key it reacts strangely. Sometimes the 
brightness is reduced as expected but often  brightness remains the same or is 
increased. Especially if the brightness is already quite low. When I kill 
gnome-power-manager I can adjust the brightness properly. Of course without 
visual indication. 
The attachment is the output of (I hit brightness down 10 times) : 
gnome-power-manager --no-daemon --verbose > verbose-mode-output.txt

output of xev after I killed gnome-power-manager (I hit the key only once):
keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0
keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0
keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0
keycode 232 = (keysym 0x1008ff03, XF86MonBrightnessDown), state = 0x0 

output of lshal -m:
12:02:13.915: computer_logicaldev_input_0 condition ButtonPressed = 
brightness-down
12:02:13.939: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down

** Affects: gnome-power-manager (Ubuntu)
     Importance: Undecided
         Status: New

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Brightness down key doesn't work properly on dell mini (Jaunty Beta)
https://bugs.launchpad.net/bugs/355546
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