This is something that requires some physical testing to ensure it gets
done right. Unfortunately, my Macbook 5,1 laptop won't resume from
suspend, so I can't really develop a fix for this. I'm unassigning
myself.

A workaround is to unload and reload the bcm5974 kernel module:

$ sudo rmmod bcm5974
$ sudo modprobe bcm5974

This will reset the state of synaptics.

** Changed in: xserver-xorg-input-synaptics (Ubuntu)
     Assignee: Chase Douglas (chasedouglas) => (unassigned)

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https://bugs.launchpad.net/bugs/968845

Title:
  bcm5974 touchpad doesn't work after S3 on MacBookAir4,1

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