[Wayland-bugs] [Bug 93846] scrolling jump and movement threshold

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93846

--- Comment #8 from nicmus <glncst at live.it> ---
I set the touchpad speed to 0.0.

I try to restate the problem in different words. (Sorry this sort of problems
are hard to describe).

Well the problem is that I'm not able to properly point a target. I always
over/undershoot it.  Let's consider this example.

I -slowly- move the finger from the top of the touchpad to the bottom (no
movement on the x-axis). The cursor will move consequently from a point (x1,y1)
to (x1,y2). 

Now I repeat the same movement on the touchpad but -faster-. Again the cursor
on the screen moves from (x1,y1) to (x1,y2). 

This is not the behaviour I'd expect. 
When I move the finger faster I expect the cursor to reach a point (x1,y3) with
y3 > y2. This is exactly what happens in synaptics driver. The range of the
cursor movement on the screen depends on the speed I'm moving my finger on the
touchpad.
(Note: I restricted the movement on the y axis albeit the problem applies
generally)


In the previous comment there is attached a short video of the odd scrolling
behaviour.

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