After recently purchasing one of these laptops and deciding to update from vanilla Ubuntu 12.04 LTS to 13.10 I found the touchscreen was no longer working.
The solution, happily, turns out to be extremely simple. I updated to Kernel 3.12 from the Ubuntu Kernel PPA.
Download the appropriate deb files for your version of the OS, for me these were:
sudo dpkg -i linux*3.12*.debAssuming there were no errors, reboot and you should be set.