[Bug 1696929] [NEW] Touchpads are unresponsive and laggy for small finger movements

[Launchpad Bug Tracker]

You have been subscribed to a public bug by Daniel van Vugt (vanvugt):

Touchpads are unresponsive and laggy for small finger movements. This is
a regression caused by the introduction of libinput, visible on at least
Lenovo X1 Carbon gen 4 and 5, Dell XPS 13, and Apple Macbook Air.

WORKAROUND (1)

1. Log into "Ubuntu on Xorg" only. This workaround only works for Xorg.
2. sudo apt install xserver-xorg-input-synaptics
3. Tweak your personal preferences using 'synclient' (the GUI settings won't work any more). For example:
   synclient HorizHysteresis=0 VertHysteresis=0

WORKAROUND (2)

1. Downgrade to version 1.9.4-1 of libinput: https://launchpad.net/ubuntu/+source/libinput/1.9.4-1/+build/13855729
That version contained the fix for this bug, briefly.

RELEVANT UPSTREAM BUGS ABOUT THE SAME ISSUE:

https://bugs.freedesktop.org/show_bug.cgi?id=98839
https://bugs.freedesktop.org/show_bug.cgi?id=101428
https://bugs.freedesktop.org/show_bug.cgi?id=100752
https://bugs.freedesktop.org/show_bug.cgi?id=104470
https://bugs.freedesktop.org/show_bug.cgi?id=103619

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: libinput10 1.6.3-1ubuntu1
ProcVersionSignature: Ubuntu 4.10.0-22.24-generic 4.10.15
Uname: Linux 4.10.0-22-generic x86_64
ApportVersion: 2.20.5-0ubuntu4
Architecture: amd64
Date: Fri Jun  9 14:52:18 2017
InstallationDate: Installed on 2017-06-08 (0 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Alpha amd64 (20170607)
SourcePackage: libinput
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: libinput
     Importance: Medium
         Status: Fix Released

** Affects: libinput (Ubuntu)
     Importance: High
     Assignee: Daniel van Vugt (vanvugt)
         Status: In Progress

** Affects: libinput (Ubuntu Bionic)
     Importance: High
     Assignee: Daniel van Vugt (vanvugt)
         Status: In Progress


** Tags: amd64 apport-bug artful
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Touchpads are unresponsive and laggy for small finger movements
https://bugs.launchpad.net/bugs/1696929
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