In my case (Dell Inspiron 9400) I get 4 events with every key press, and 4 
brightness level change by gnome-power-manager respectively.
This is with 1 brightness down key press:

[EMAIL PROTECTED]:~$ lshal -m

Start monitoring devicelist:
-------------------------------------------------
19:25:50.117: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down
19:25:50.124: computer_logicaldev_input_1 condition ButtonPressed = 
brightness-down
19:25:50.124: computer_logicaldev_input condition ButtonPressed = 
brightness-down
19:25:50.328: platform_i8042_i8042_KBD_port_logicaldev_input condition 
ButtonPressed = brightness-down

** Attachment added: "lshal.txt"
   http://launchpadlibrarian.net/13974293/lshal.txt

-- 
Screen brightness double level changes
https://bugs.launchpad.net/bugs/207473
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