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

[Daniel van Vugt]

Actually we don't need to ignore it. We can release the fixes for the
regression. The fixes are:

1. libinput: https://lists.freedesktop.org/archives/wayland-devel/2018-January/036475.html (not landed yet)
2. kernel: https://bugs.freedesktop.org/show_bug.cgi?id=104533 (not tested yet)

James will need both, but as I understand it only the libinput fix is
required for all touchpads in general. So we only need to wait for #1. I
plan on testing it across a few laptops this week to get ahead of the
ball.

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Title:
  Touchpads are unresponsive and laggy for small finger movements

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

Bug description:
  Some laptop touchpads are annoyingly unresponsive when the software
  implements any kind of hysteresis. 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.

  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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