Cannot say for yours, but
I once had an HP that had a 'dedicated' scroll area on the touchpad.
I then got a Toshiba that didnt have one.
I missed it until I had Ubuntu running and realized that, if I have my finger HALFWAY on the right side of the pad it scrolls...
Dont know if it is a function of the PAD or the software, but...
You might wanna try that.