Login screen bypassed for at least 20 seconds after awakening machine from suspend

[Wise Melon]

Since upgrading to GNOME 3.20 on Ubuntu GNOME 16.04 I have noticed something rather worrying which has occurred twice so far, this is what I have observed:

1. After opening my laptop lid the screen either goes black or displays a frozen state of the shield opening or something similar

2. Then it suddenly shows Firefox (the last window I had open, though I did minimize it before suspending my machine my closing the laptop lid) and actually allows me to use my mouse to interact with it by going to a new tab, or really anything I want, I haven't tried to see if I am able to type in this state yet or not, but I will update this report the next time I manage to test it out. This is obviously a really bad thing for security as for at least 20 long seconds (each time it occurs it seems to last longer) it logs you straight back in and bypasses the login screen, though for some reason the title part of the window and everything above that are completely black as if someone just put a big black box over them.

3. I then suddenly see black and no Firefox (this black only lasts for a short period though), then I see what I see when I would normally log in for the first time (my background image coming in with that getting larger image with the top bar at the top of it), and then it's back to the normal locked screen as it should be.

The sequence of events (what I see on my screen) seems to vary between occasions, but the ability to interact with my machine without having to log in stays even though it at some point does register that it should really be taking me to the locked screen. And I have checked and if I for instance open a new tab and go to one of my bookmarks in Firefox during this strange bypassing period, when I properly log back in again (and find Firefox minimized as I left it) I find that that tab is still open so the changes are real and lasting.

[Alberto Salvia Novella (es20490446e)]

@ Marc Deslauriers

Instead of confirming bugs by changing its status, consider confirming them by clicking on the "Affects me too" link. This way bug heat will also rise 🔥

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1532508, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.