I have 12.04 installed, my notebook model is HP DV4-1313dx.
I also have everything working, but no touchpad support of any kind.
It also seem like HP, has some sort of combined keyboard/mouse device.
Its identified as, "MCE IR Keyboard/Mouse (ene_ir)"
So it's not any of the three old school touchpad brands.
I actually found an answer for my problem at askubuntu.com
This is what worked for me,
echo "options psmouse proto=imps"|sudo tee -a /etc/modprobe.d/psmouse.conf; sudo modprobe -r psmouse; sudo modprobe psmouse