After some more testing I can add the following:

- The bug is consistently triggered by a suspend/resume cycle (sudo pm-suspend)
- An easier workaround instead of logging out and back in is to switch to a 
different VT and switch back.
- Right after resuming, the computer behaves as if the left mouse button was 
continuously pressed. For instance if the cursor is over selectable text when 
resuming, moving the mouse selects text as if the button was pressed. Actually 
pressing the button does nothing. 
- xev shows no message at all when pressing the left button. Moving the mouse 
or pressing the right button show the expected messages.

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https://bugs.launchpad.net/bugs/1752709

Title:
  Regression: left mouse button stops working

Status in gnome-shell package in Ubuntu:
  New

Bug description:
  Sometimes the left mouse button stops working. The right button, the
  movements, and the keyboard all still work normally. The laptop's
  touch screen also still works. The left mouse button doesn't work
  anywhere, neither in the application nor in the shell widgets.

  Unplugging/plugging the (usb) mouse has no effect.

  Logging out and back in does temporarily solve the problem.

  It usually occurs after resuming from suspend, but it once did occur
  shortly after plugging in an usb pendrive (this might be a coincidence
  of course).

  This is with Gnome Shell on Wayland, on 18.04.

  This report is similar to bug 1743183, except in that bug it seems the
  left mouse button never works in Wayland. In my case, it usually
  works, but stops working after a while.

  ProblemType: Bug
  DistroRelease: Ubuntu 18.04
  Package: gnome-shell 3.26.2-0ubuntu3
  ProcVersionSignature: Ubuntu 4.15.0-10.11-generic 4.15.3
  Uname: Linux 4.15.0-10-generic x86_64
  ApportVersion: 2.20.8-0ubuntu10
  Architecture: amd64
  CurrentDesktop: GNOME
  Date: Thu Mar  1 17:26:46 2018
  DisplayManager: gdm3
  InstallationDate: Installed on 2015-01-23 (1132 days ago)
  InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
  SourcePackage: gnome-shell
  UpgradeStatus: Upgraded to bionic on 2018-01-10 (49 days ago)

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