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



** Also affects: mutter (Ubuntu)
   Importance: Undecided
       Status: New

** Changed in: mutter (Ubuntu Eoan)
       Status: New => Invalid

** Changed in: mutter (Ubuntu Bionic)
       Status: New => Incomplete

** Changed in: mutter (Ubuntu Bionic)
     Assignee: (unassigned) => Daniel van Vugt (vanvugt)

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https://bugs.launchpad.net/bugs/1832138

Title:
  Login screen never appears on vmwgfx but installing kernel >=
  v4.17-rc1 fixes it

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