Hello, I have the same problem.
I found this thread, http://ubuntuforums.org/showthread.php?t=2182922&page=2 
that gave a solution to a similar problem :
create a file here /etc/pm/sleep.d/0000trackpad
sudo gedit /etc/pm/sleep.d/0000trackpad

and add the following
#!/bin/sh
case "$1" in
    suspend|hibernate)
         modprobe -r psmouse ;;
    resume|thaw)
        modprobe psmouse ;;
esac

it didn't work at first because of the double " ; " so I changed it to 
#!/bin/sh
case "$1" in
    suspend|hibernate)
        modprobe -r psmouse;
    resume|thaw)
        modprobe psmouse;
esac

and now, the computer refuse to sleep. At least, the touchpad keep
working so it does something but I can't make my conputer sleepin...

By the way, if it gives a clue, I can deactivate and activate again the
touchpad with the hotkey of my keyboard.

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https://bugs.launchpad.net/bugs/1490130

Title:
  Elantech touchpad stops working after suspend

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