Filed a bug on this too:

https://bugzilla.kernel.org/show_bug.cgi?id=15780

This particular laptop will lose it's synaptics touch
pad on return from suspend state. Reloading the psmouse
module makes no difference. I came up with the attached
work around which simply calls psmouse_reset on the
port should the initial probe fail. This solves the problem
for me and I've tested this on several laptops.

Initially discovered on Ubuntu 2.6.31 (karmic) and the problem
continues to exist in lucid 2.6.32. I've filed a bug against
ubuntu kernel here:

https://bugs.launchpad.net/oem-priority/+bug/551234

though the Ubuntu kernel team would really like to get upstream's
input on the matter before accepting the patch. Please
let me know what you think. Thanks.

Peter