Comment 2 for bug 34501

I would encourage you to try out xfree86 driver if you can, it is listed as solution for Bug #47971. The patch given was
'sudo apt-get install xfree86-driver-synaptics'
install xfree86's driver (and uninstall xorg's)
Then, symlink the driver into it's proper location for xorg by typing
'sudo ln -sf /usr/X11R6/lib moules/input/synaptics_drv.o /usr/lib/xorg/modules/input/synaptics_drv.o'
Then, reboot! It's just a workaround, but it would help in figuring things out.