[ubuntu] Touchpad of Toshiba NB305 not working

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http://ubuntuforums.org – Hi, I'm using a Toshiba NB305 with Ubuntu 11.04. At least 50% of the times I start it up, the touchpad does not work [and doesn't even show up in the System->Preferences->Mouse]. The external mouse works always. When the touchpad does work, I can see the Touchpad tab in the System->Preferences->Mouse.. I don't want to have to carry with me an external mouse, but then I'd have to boot several times, and hope that the touchpad will show up.. Thanks for any help I can get. (Hardware)