[Wayland-bugs] [Bug 91135] Two-finger scrolling jumpy with Synaptics touchpad

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91135

--- Comment #15 from Benjamin Tissoires <benjamin.tissoires at gmail.com> ---
(In reply to Peter Hutterer from comment #14)
> before this, slot 0 is on 3481/2721, slot 1 is on 4224/1777. In the event
> where the slot 1 ends slot 0 jumps to slot 1 positions *for a single event*.
> In the next event it is back to 3478/2702, i.e. the previous slot 0 position.
> 
> Benjamin, is this something we can detect in the kernel or do I need to work
> around it? This is a semi-mt buttonpad.

I can't figure out which code path we manage to trigger here. But it's unlikely
the kernel will be able to fix those jumps.
I think the best course of action is to ignore/reset the coordinates when the
contact count changes. SEMI_MT are such a pain :(

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