Trackpad not working in Mac OS X Lion Pre-Boot Authentication (PBA) with File Vault 2

I set up File Vault 2 in Mac OS X Lion with Pre-Boot Authentication (PBA). In PBA-login my Trackpad on my MBP Mid. 2010 is not working. I cannot select the user i want to log in with.
My Magic Trackpad reconnects if i click the power button but i usually leave it at home and i am now unable to use my Macbook Pro after i have to restart while away from home. 
Any suggestion is appreciated.

http://support.apple.com/kb/HT2311?viewlocale=en_EN

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