I have a thinkpad T520, and my touchpad stopped working after upgrade.   
I tracked /etc/acpi/events/lenovo-touchpad to a problem with the getXuser 
function in /usr/share/acpi-support/power-funcs.

I changed this line:
        user=$(who | awk "/:$displaynum)/ { print \$1; exit }")
to this (escaping the parenthesis):
        user=$(who | awk "/:$displaynum\)/ { print \$1; exit }")

and I was able to enable my touchpad.

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

Title:
  can't enable touchpad in Ubuntu 11.10

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