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

[Launchpad Bug Tracker]

This bug was fixed in the package libinput - 1.9.4-2ubuntu1

---------------
libinput (1.9.4-2ubuntu1) bionic; urgency=medium

  * Restore and refresh fix-lp1696929.patch to fix unresponsive/laggy touchpad
    behaviour caused by inappropriate use of software hysteresis (LP: #1696929)
    This time the patch includes the fix for Debian bug #884599.

 -- Daniel van Vugt <daniel.van.vugt at canonical.com>  Mon, 22 Jan 2018
16:18:09 +0800

** Changed in: libinput (Ubuntu Bionic)
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1696929

Title:
  Touchpads are unresponsive and laggy for small finger movements

Status in libinput:
  Fix Released
Status in libinput package in Ubuntu:
  Fix Released
Status in libinput source package in Bionic:
  Fix Released

Bug description:
  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)

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