Comment 126 for bug 1722478

I sometimes get the jitter too but I've yet to find a reliable way to reproduce it.

I also get low speed jitter where the packets reported to the interrupt handler don't have new x and y coords but the pressure is changing. This results in jerkiness at very low speed which I can reliably reproduce.

This looks to some extent like h/w (or rather touchpad firmware) but i need to work my way down the input stack to convince myself of that yet.

I'm trying to work through touchpad related stuff this week as i have some spare time. I'll update if i get anywhere.