Comment 92 for bug 1166442

For me it worked with DKMS and the kernel sources. I did something like this:

sudo apt-get install dkms
# now get the kernel sources from kernel.org, and extract it somewhere. then:
cd /usr/src
sudo mkdir psmouse-elantech-fix
sudo cp /path/to/downloaded/kernel/drivers/input/mouse/* psmouse-elantech-fix
# then build the drivers with dkms
sudo dkms add -m psmouse -v elantech-fix
sudo dkms build -m psmouse -v elantech-fix
sudo dkms install -m psmouse -v elantech-fix

and it should work. try reloading the psmouse driver
sudo modprobe -r psmouse ; sudo modprobe psmouse

xinput should now show ETPS/2 Elantech Touchpad