I've the same laptop and I make it work by using the following flag in 
/etc/default/grub
GRUB_CMDLINE_LINUX="i8042.noloop=1"

This post gave me the solution: 
http://forum.novatech.co.uk/archive/index.php/t-26251.html

After that you have to recreate the boot grub entry (I'm on ArchLinux: 
grub-mkconfig -o /boot/grub/grub.cfg. I think that in Ubuntu the command is 
"update-grub").
Then reboot and you will have a fully functional trackpad (mine it is detected 
by xorg as "SynPS/2 Synaptics TouchPad").

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https://bugs.launchpad.net/bugs/1386802

Title:
  Synaptics touchpad is not detected on Ubuntu 14.04.1 LTS (64bit)

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