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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #3 from Peter Hutterer <peter.hutterer at who-t.net> ---
First: the arch wiki page [1] is out of date, most of this won't work on
libinput devices since we moved the acceleration into libinput. You'll need to
set the "libinput Accel Speed" property to a value between [-1, 1], where
anything > 0 is faster than the default

[1] https://wiki.archlinux.org/index.php/Mouse_acceleration


I looked at your recording, and my calculations say you've moved your scroll
motion by 4.5mm. That's not a lot, but libinput-debug-event says libinput is
sending about ca 30 small scroll events, with a value of 1.48 pixels each
(except two are 3px and one is 0.37px). Can you run libinput-debug-event and
match the output with the visual output? maybe the events are lost in the xorg
driver or the server?

the finger movement before the scroll recording too shows a movement of less
than 1mm. that's a pretty tiny movement, and half of that would be swallowed by
the hysteresis of 0.5mm. Having said that, this is extremely fine-grained
movement, is this really how you interact with the touchpad?

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