I have a newish Lenovo Ideapad V460 with an Elan touchpad of some kind
in it. I was experiencing some trouble as people described above, no
mouse functionality in Xorg or GPM. I got the touchpad to work by doing:

rmmod psmouse
modprobe psmouse proto=imps

proto=exps also seems to work. No synaptics functionality seems to be
present, but it does make the mouse work in Xorg without any other
configuration changes.

added "option psmouse proto=imps" to /etc/modprobe.d/touchpad.conf to
get the option to persist.

It's not a fix, but it does allow me to use the mouse on this machine
now.

-- 
touchpad lockup/drag and lost scroll
https://bugs.launchpad.net/bugs/34501
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which is subscribed to xserver-xorg-input-synaptics in ubuntu.

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