Comment 132 for bug 681904

himegoto: First, please run 'sudo modprobe psmouse' (which I'm expecting will fail), then 'dmesg > dmesg-psmouse-elantech-dkms.txt'. Please provide the output from modprobe and the dmesg-psmouse-elantech-dkms.txt file here. After that you can remove the package by running 'sudo dpkg -r psmouse-elantech-dkms'. Then running 'sudo modprobe psmouse' should get your touchpad working again.

EricDP: Your problem is due to configuration differences between i386 and amd64 kernels in conjunction with how I created the dkms package. I've uploaded a new package which should fix this. Please give it a try.

http://people.canonical.com/~sforshee/lp681904/psmouse-elantech-dkms/v0.2/psmouse-elantech-dkms_0.2_all.deb