I think that I had the same problem. I fixed it with:
sudo modprobe -r psmouse
sudo modprobe psmouse proto=imps
sudo dpkg-reconfigure xserver-xorg-input-synaptics
cd /etc/udev/rules.d
sudo nano touchpad.rules
Paste:
ACTION!="add|change", GOTO="xorg_synaptics_end"
KERNEL!="event*", GOTO="xorg_synaptics_end"
ENV{ID_INPUT_TOUCHPAD}!="1", GOTO="xorg_synaptics_end"
ENV{x11_options.MaxTapTime}="300"
LABEL="xorg_synaptics_end"
sudo reboot
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https://bugs.launchpad.net/bugs/1739073
Title:
'Synaptics Touchpad' incorrectly detected as PS/2 mouse in 'Lenovo
Thinkpad x120e AE' suddenly
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