The trackpad on my ASUS laptop doesn't work after I press off and then on. Before I press off the first time it works well, afterwards it doesn't work even though the light indicator is on. This problem has happened to me since Ubuntu 10.04/Linux Mint 9/and now 10.10, it works fine on Win7, but I don't really want to boot there ;).
it is indeed a bug as discussed here:
this is not a cure for the bug, but get your trackpad running again, run: