[Wayland-bugs] [Bug 104788] Touchpad hysteresis doesn't work

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104788

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |peter.hutterer at who-t.net
         Depends on|                            |98839
             Status|NEW                         |NEEDINFO

--- Comment #2 from Peter Hutterer <peter.hutterer at who-t.net> ---
libinput looks at the touchpad motion and if the finger is down for some time
without motion events (i.e. without wobbles) the motion hysteresis is disabled.
See bug 98839.

This would explain why it works after login and then starts wobbling later -
likely after the hysteresis was disabled. Once disabled, it stays disabled
until you log out/restart.

You can easily verify this with sudo libinput debug-events --verbose, pipe it
into a file and check for a hysteresis disabled message once it starts
wobbling.

To debug this further though I'll need an evemu record that triggers this
because the one you attached doesn't seem to disable the hysteresis.


Referenced Bugs:

https://bugs.freedesktop.org/show_bug.cgi?id=98839
[Bug 98839] Somehow conditionalize hysteresis (hardware black/whitelist, device
property introspection, user-exposed setting, etc)
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