Public bug reported:

Normally I use click-hold-and-move to e.g. move windows around on the screen. 
This action works fine with the touchpad also directly after booting, but after 
Suspend and reawakening, I can only move the window (or other item) a few 
pixels. The hold is still recognised but any movements on the touchpad are not.
If I click and then use the Lenovo pointing stick, it works, likewise if I use 
the buttons above the touchpad, it also works. In spite of the relatively 
straightforward workaround this is very annoying and prevents (for me) 
one-handed use of the touchpad. 
Also, this is a kernel-based regression: on 4.15.0.36 it is broken but for 
4.15.0.34 it works fin,

My hardware: Lenovo X1-Carbon, 5th generation

Description:    Ubuntu 16.04.5 LTS
Release:        16.04

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.15.0-36-generic 4.15.0-36.39~16.04.1
ProcVersionSignature: Ubuntu 4.15.0-36.39~16.04.1-generic 4.15.18
Uname: Linux 4.15.0-36-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.18
Architecture: amd64
CurrentDesktop: MATE
Date: Sun Oct 21 16:35:18 2018
InstallationDate: Installed on 2018-01-23 (271 days ago)
InstallationMedia: Ubuntu-MATE 16.04.3 LTS "Xenial Xerus" - Release amd64 
(20170801)
SourcePackage: linux-signed-hwe
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: linux-signed-hwe (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1799055

Title:
  Touchpad click&drag no longer works after suspend

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