This definitely is not problem with gnome-flashback, at login screen
gnome-flashback is not started.
Don't know if that will work for you, but once it worked for me. You
could try to copy your working /home/{your-user}/.config/monitors.xml
file to /var/lib/lightdm/.config/monitors.xml. If that does not help
remember to delete it from /var/lib/lightdm/.config
Other option might be to create /etc/X11/xorg.conf with correct
configuration. Or if you already have one then maybe try to temporarily
remove it.
Since you say that happens after updating to xorg/xserver-hwe-16.04 that
could indicate that this is bug/regression in xorg.
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https://bugs.launchpad.net/bugs/1665853
Title:
Gnome Flashback: Could not assign CRTC to outputs, ignoring
configuration
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