Could you try the following:
Before suspend:
$ sudo rmmod psmouse
After resume:
$ sudo modprobe psmouse
** Changed in: linux-source-2.6.22 (Ubuntu)
Assignee: (unassigned) => Canonical Kernel Team
Status: New => Confirmed
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Touchpad doesn't work after suspend on amilo1520
https://bugs.launchpad.net/bugs/121385
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