I had this same issue on a fresh install of 10.10 through Wubi on a Sony VAIO VPCEE3WFX. After installing all the updates the trackpad works, but the right-side scroller doesn't work, even after trying the above grub edit.
I had this same issue on a fresh install of 10.10 through Wubi on a Sony VAIO VPCEE3WFX. After installing all the updates the trackpad works, but the right-side scroller doesn't work, even after trying the above grub edit.