I'm having problem with my touchpad on my laptop. My laptop is Lenovo G40-70. When first I installed Ubuntu 14.04 on my laptop the touchpad is smooth. But after that I did software update from the internet right away.
After the software update, the touchpad becomes weird, really not smooth, hard to control. I tried reinstalling the OS twice. The touchpad becomes smooth again after reinstalling the OS so I guess it's not hardware problem, but it becomes weird again after the software update.