Comment 21 for bug 1777415

> Jonathan Polak (jpolak) wrote on 2018-07-09:
> I confirm it affects Mate 18.04 as well.
>
> Moreover, a new bug on mate 18.04, plugging in an HDMI screen upon receiving the lockscreen,
> sometimes allows you to bypass it completely.

I know this bug since years. When setting my Thinkpad on the Dockingstation while it was sleeping it sometimes happens that the gnome-shell just starts without asking for a password. And I don't even have to extract the harddisk. I remember some guys of the ubuntu community told me years ago that's a known issue with Xorg and gnome-shell. I did not file a bug or was looking for a known bug because it happened very seldom but the bug persisted many years and I don't know if it was fixed until now for sure.