I got it to work on thinkpad T420 by using 
sudo xinput set-int-prop 11 "Synaptics Off" 8 0
the bug happens because there are two properties governing the touchpad "on" 
status "device Enabled" and "Synaptics Off" and they must be set to 1 and 0 
respectively if the touchpad is to work the problem arised because they 
switched asynchronously when you enable or disable the device. I couldn't 
change the device enabled property so i changed the "Synaptics Off" to 0 to get 
them back into sync. you can now disable and enable the device however i didnt 
yet restart to see what happens next time i boot up

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https://bugs.launchpad.net/bugs/804109

Title:
  can't enable touchpad in Ubuntu 11.10

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