Screen lock doesn't cover the whole screen

[Vincent Giorgi]

I noticed a rather alarming bug today.

Got a Lenovo T470P with dock and two 1440p screens.
The laptop is 1440p but I chose 1080p as scaling didn't want to play along.

To reproduce:
1. Have the laptop unlocked without the dock.
2. Lock and/or hibernate, close the lid.
3. Connect to the dock.
4. Power on the laptop trough dock.
5. The connected screens to the dock should light up with the login screen, however.. The secondary screen is only covered about 1/4, guessing the same scale as 1080p.

I could open files, browse the web and cause damage trough this method.

It also works if I lock my laptop on the dock, and someone undocks it and opens the lid, then does step 2-5 again.

I saw a "confirmed" bug from 2014, but felt that this needed to be brought up, again.

Running 18.04 LTS
gnome-screensaver on 3.6.1-ubuntu3

ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: gnome-screensaver 3.6.1-8ubuntu3
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Wed May 2 12:39:19 2018
InstallationDate: Installed on 2018-03-19 (44 days ago)
InstallationMedia: Ubuntu 17.10 "Artful Aardvark" - Release amd64 (20180105.1)
SourcePackage: gnome-screensaver
Symptom: security
Title: Screen locking issue
UpgradeStatus: Upgraded to bionic on 2018-05-02 (0 days ago)

[Marc Deslauriers (mdeslaur)]

Which desktop environment are you using? Could you get a picture of the issue? Thanks!

[Launchpad Janitor (janitor)]

[Expired for gnome-screensaver (Ubuntu) because there has been no activity for 60 days.]