[Wayland-bugs] [Bug 98839] Somehow conditionalize hysteresis (hardware black/whitelist, device property introspection, user-exposed setting, etc)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98839

--- Comment #27 from Daniel van Vugt <daniel.van.vugt at canonical.com> ---
I would like to help with this problem when I find time myself...

It appears some common laptops like Lenovo X1 Carbon (gen4 and gen5) need at
lot of work and are borderline unusable
(https://bugs.launchpad.net/ubuntu/+source/libinput/+bug/1696929)

However having used the Xorg synaptics driver in the past I know half the
problem is hysteresis, which needs to be turned off. The other half the problem
seems to be a regression in Synaptics hardware/firmware after the gen3 X1
Carbon. Frankly, it's still laggy even without hysteresis, but at least becomes
usable.

Also, regarding "there's some other bug that snaps it to the axes"; yes, that's
a visible problem. Drawing circles (not even tiny ones) on the touchpad results
in the cursor moving in a square. It sounds to me like hysteresis has been
implemented per-axis, when actually it might be better implemented in an
omnidirectional fashion (one threshold, not one threshold per axis) using
simple Pythagoras.

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