The touchpad on my ASUS notebook used to work fine in 10.10.
After upgrading to 11.04 and then to 11.10, it is gone.
I've already tried the two solutions described at: Touchpad not working on Dell XPS L501x
unchecking "disable touchpad when typing": doesn't work (even if it did it would not be a solution: what if I do want it to be disabled when typing?) but anyway it doesn't work at all
the file /etc/acpi/asus-touchpad.sh and changing the name of the brand.