I have the problem in Ubuntu, Kubuntu, Lubuntu and Mint 11.10 with ThinkPad 
T520.
Defual 6 steps.
After "echo -n N | sudo tee 
/sys/module/video/parameters/brightness_switch_enabled"
increased to 9 Steps
In tty with brightness_switch_enabled=Y 16 steps
In tty with brightness_switch_enabled=N not working

xbacklight works flawlessly though.

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https://bugs.launchpad.net/bugs/257827

Title:
  brightness changes twice when using hotkeys

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