Touchpad does not work on Acer Aspire V5-121, on

Touchpad does not work on Acer Aspire V5-121, on

I recently installed Ubuntu 13.04 on my new Acer Aspire V5-121 Netbook. The first thing I noticed was that the touchpad does not work. It does not recognize clicks or touches. How do I find out what's wrong, and fix it?
I did not find any proprietary drivers for the Touchpad offered by Ubuntu. The package xserver-xorg-input-synaptics is already installed.
xinput list shows the following:
# xinput list
⎡ Virtual core pointer                          id=2    [master pointer  (3)]
⎜   ↳ Virtual core XTEST pointer                id=4    [slave  pointer  (2)]
⎜   ↳ PixArt Microsoft USB Optical Mouse        id=10   [slave  pointer  (2)]
⎜   ↳ PS/2 Generic Mouse                        id=13   [slave  pointer  (2)]
⎣ Virtual core keyboard                         id=3    [master keyboard (2)]
↳ Virtual core XTEST keyboard               id=5    [slave  keyboard (3)]
↳ Power Button                              id=6    [slave  keyboard (3)]
↳ Video Bus                                 id=7    [slave  keyboard (3)]
↳ Power Button                              id=8    [slave  keyboard (3)]
↳ Sleep Button                              id=9    [slave  keyboard (3)]
↳ HD WebCam                                 id=11   [slave  keyboard (3)]
↳ AT Translated Set 2 keyboard              id=12   [slave  keyboard (3)]
↳ Acer WMI hotkeys
I've already tried the solutions outlined here, for a somewhat similiar issue: Touchpad stopped working on an Acer AspireOne D255E . But the solutions outlined here did not help.