Password required twice returning from suspend

Finding this to not be an issue when nvidia drivers are installed.

As an observation, it is noticeably slower to show the login screen using nvidia opposed to nouveau.

The relevant part of the log is:
[+121.84s] DEBUG: Session pid=2651: Authentication complete with return value 0: Success
[+121.84s] DEBUG: Authenticate result for user wolf: Success
[+121.84s] DEBUG: User wolf authorized
[+121.85s] DEBUG: Greeter sets language en_GB
[+121.94s] DEBUG: Greeter requests session xubuntu
[+121.94s] DEBUG: Seat seat0: Returning to existing user session wolf
[+121.94s] DEBUG: Unlocking login1 session c2
[+121.94s] DEBUG: Activating VT 7
[+122.07s] DEBUG: Seat seat0: Stopping greeter
[+122.07s] DEBUG: Terminating login1 session c4
[+122.09s] DEBUG: Session pid=2573: Sending SIGTERM
[+122.09s] DEBUG: Activating login1 session c2
[+122.09s] DEBUG: Session pid=2651: Exited with return value 0
[+122.09s] DEBUG: Seat seat0: Session stopped
[+122.09s] DEBUG: Seat seat0 changes active session to c2
[+122.09s] DEBUG: Session c2 is already active
[+122.12s] DEBUG: Greeter closed communication channel
[+122.12s] DEBUG: Session pid=2573: Exited with return value 0
[+122.12s] DEBUG: Seat seat0: Session stopped
[+122.12s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+122.12s] DEBUG: Sending signal 15 to process 2567
[+122.21s] DEBUG: Process 2567 exited with return value 0
[+122.21s] DEBUG: XServer 1: X server stopped
[+122.21s] DEBUG: Releasing VT 8
[+122.21s] DEBUG: XServer 1: Removing X server authority /var/run/lightdm/root/:1
[+122.21s] DEBUG: Seat seat0: Display server stopped
[+125.49s] DEBUG: Seat seat0: Locking
[+125.49s] DEBUG: Seat seat0: Creating greeter session

Which looks like another race condition - I think LightDM has decided that there's nothing running on that seat for some reason and started another greeter.

Face the same issue with lightdm 1.18.3 Seems like a regression to me.