Touchpad doesnt work except with activation before log in

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http://askubuntu.com – I bought an Acer M3-481. I am running 12.04 64 Bit I have to activate the mtouchpad with Fn + F7 before log in. It works perfectly then. If I forget to turn activate before login, i cant switch on the touchpad except if I reboot and activate before login. When I am logged in the OSD shows the touchpad being activated when I press Fn + F7 but the tocupad still doesnt react. Can I automate the activation of the touchpad on start up? (HowTos)