[Wayland-bugs] [Bug 105640] Lenovo T440p - slow fine touchpad movement makes cursor jump

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Tue Apr 3 23:49:30 UTC 2018


https://bugs.freedesktop.org/show_bug.cgi?id=105640

--- Comment #12 from Peter Hutterer <peter.hutterer at who-t.net> ---
> (EE) event19 - Synaptics tm2964-001: kernel bug: Touch jump detected and discarded.

Right, so this means even without the patch, libinput discards some jumping
motion.

> On Xorg with synaptics touchpad work perfectly.

tbh, I don't quite know how this could be, iirc synaptics doesn't do any
pointer jump mitigation and these events are just forwarded as-is. Only
possibility here is that the acceleration ramp-up is higher and thus these get
filtered out in the acceleration code somewhere.

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