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Trackpad kexts under Lion

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i need a little help about this question.

when I install Lion on my notebook, at the first boot (when I boot from usb pendrive with Lion Installer) the system recognize automatically the keyboard and the trackpad without loading any next like appleps2controller or others, and works also the trackpad prefpane under system preferences and the gestures like two finger scrolling.

But when I install chameleon on the Lion HD partition, after the new boot from hard disk, keyboard and trackpad aren't recognized until I install ApplePs2controller and AppleAcpiPs2Nub.

Anyone knows why?

What I'm searching to understand is where the system takes the drivers to make works trackpad and keyboard at the first boot from usb. I've searched in the Lion Installer on the usb stick but I haven't found no kexts.


thanks in advance

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