[Wayland-bugs] [Bug 97194] touchpad jumping cursor

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97194

Peter Hutterer <peter.hutterer at who-t.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |NEEDINFO

--- Comment #4 from Peter Hutterer <peter.hutterer at who-t.net> ---
urgh, this is still north of 1500 events to sift through. for next time, please
keep it as short as possible, ideally only one sequence.

but something is seriously wrong with this touchpad. it suggests you recorded
40 finger sequences here but a large percentage of those have no or hardly any
events. e.g. see 1.988464,  2.148737, 3.255834, 9.491922, 9.644970
This suggests that the hardware loses tracking here and thinks the finger is up
when it is still down. Since I don't know what you did to get this recording
I'm assuming you had the finger down for most of the time, just executing a
couple of normal motions?

2.148737 shows up as a jump her but event-wise it looks like a normal (albeit)
short touch.

12.063640 is the second jump (could be the one you referred to) and that is
probably a bug. The issue here is that the finger starts on Y:138, the second
finger sets down, finger 1 moves to 151 with two fingers down, then 178 in the
same frame the second finger is released. The two finger movment doesn't
trigger a gesture (probably not hitting the thresholds, doesn't matter anyway).
The last Y event is in the same frame as the finger release and triggers a
motion event (from 151 - 178 device coords) - that's the jump seen. Sequence
ends at 12.200861.

The main question now is: is this the jump you're talking about? the one on
2-to-1 finger transition?

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