[Wayland-bugs] [Bug 95290] synaptics touchpad jitter

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95290

            Bug ID: 95290
           Summary: synaptics touchpad jitter
           Product: Wayland
           Version: 1.2.x
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: libinput
          Assignee: wayland-bugs at lists.freedesktop.org
          Reporter: liam at fightingcrane.com

Created attachment 123515
  --> https://bugs.freedesktop.org/attachment.cgi?id=123515&action=edit
libinput version, settings, vendor model #, modalias, trackpad dimensions

The trackpad passes along movement even when my fingers aren't moving.
Depending on context,this manifests as either a jittery pointer (randomly hops
about a, roughly, five square pixel area) or, when I've two fingers on the
trackpad, it will randomly scroll by about the same amount as the pointer
jitters.

This bug looks a bit simlar to #94097
(https://bugs.freedesktop.org/show_bug.cgi?id=94097), but that patch seems
aimed at SEMI_MT synaptics, while mine lacks that property according to
evemu-describe.
I tried mtview, but the jitter wasn't visible, and, unfortunately, I couldn't
determine how to pipe evemu-play to mtview.
I also tried generating a hwdb entry but that doesn't seem to have worked (I
reloaded udev using systemctl, but I haven't yet rebooted).

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