[ubuntu] How to disable (t400s) the touchpad in Ubuntu v9.10 beta?

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http://ubuntuforums.org – Hi, all. I've been working with t400s (Lenovo). Ubuntu v9.04 does not have any problem with my laptop, but Ubuntu v9.10 beta has a problem. One thing I found is that I cannot disable the touchpad. The function key for enabling and disabling the touchpad ( Fn + F8 ) does not work. Note that other function keys are well working. Anyone know how to solve it? I just disable the touchpad and then want to use only the trackpoint. (Hardware)