Display brightness levels (on Thinkpad T60)

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http://crunchbanglinux.org – On this machine, I can adjust the brightness of the display by pressing the Fn and Home/End buttons on the keyboard.  After booting into Waldorf, only 3 levels of brightness are available.  However, before booting into the desktop, there are at least 5 levels.  There are even 7 levels in Windows XP (dual boot alongside #!).Any idea to make finer adjustments possible?  Thanks in advance. (HowTos)