Remote production server unable to access using vnc after kernel upgrade.
Apparently lightdm failed. Repeatable.
GT218(GeForce 210) ~ video-nvidia-340xx
Workaround downgrade to 5.4.62-1-MANJARO.
Will upgrade to prior kernel on next reboot (5.7.19-2).
Nearly identical system, GF119(GeForce GT 610) ~ video-nvidia-390xx, and two other systems upgraded to 5.8.6-1-MANJARO without problems.