Comment 31 for bug 1832138

Interesting one of the commits mentioned above:

  37efe80ce85f drm/vmwgfx: use monotonic event timestamps
  (https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?h=v5.2-rc5&id=37efe80ce85f)

is related to what I changed in the latest update to mutter:

  https://gitlab.gnome.org/GNOME/mutter/commit/e9e4b2b72

The latest update to mutter requires monotonic event timestamps in the kernel driver in order to work properly. It should kind of work without them, but that fallback is untested...

So if that is the problem then you might find reverting to the previous mutter version also works around the issue(?). You can download the debs:

  https://launchpad.net/ubuntu/+source/mutter/3.28.3+git20190124-0ubuntu18.04.2/+build/16644915

and then try installing them together:

  dpkg -i *.deb