Screen shown briefly after opening closed laptop lid, before even unlocking

Bug #1532508 reported by Nicolas_Raoul on 2016-01-10
This bug affects 37 people
Affects Status Importance Assigned to Milestone
In Progress
Ubuntu GNOME
gnome-shell (Debian)
gnome-shell (Ubuntu)
unity (Ubuntu)
Andrea Azzarone

Bug Description

Steps to reproduce:

1. Work on highly secret files
2. Close the lid of your laptop and go have a break
3. Anyone who opens the lid of the laptop can see the secret files for a half second before the lock screen appears

Video showing the bug:

Reproduced on Ubuntu 2015.10, Ubuntu 2014.04

Related branches

CVE References

information type: Private Security → Public Security
Changed in unity (Ubuntu):
status: New → Confirmed
Andrea Azzarone (azzar1) wrote :

This is actually due to a graphic driver issue that we cannot workaround in unity. In xenial we reduced a bit the problem but we cannot completely remove it.

I can reproduce this issue in Ubuntu GNOME 16.04 with GNOME 3.20. Should updating the graphics driver fix the issue?

Changed in ubuntu-gnome:
status: New → Confirmed
Changed in gnome-shell (Ubuntu):
status: New → Confirmed
sunox (sunox9) wrote :

I experience this only when using compton compositor. This is on a Thinkpad T430 running Xubuntu 16.04.

Rael Gugelmin Cunha (rael-gc) wrote :

Started to happen to me on Ubuntu 16.04.2 with Intel graphics too (Dell Precision M3800). I was using 16.04 and then made a fresh install of 16.04.2

Nybo (renenybo) on 2017-04-08
information type: Public Security → Private Security
information type: Private Security → Public Security
tags: added: trusty wily xenial
Changed in gnome-shell (Debian):
status: Unknown → Confirmed
Changed in gnome-shell:
importance: Unknown → Medium
status: Unknown → In Progress
Changed in gnome-shell (Ubuntu):
importance: Undecided → High
Changed in unity (Ubuntu):
importance: Undecided → High
tags: added: zesty
Andrea Azzarone (azzar1) on 2017-09-19
Changed in unity (Ubuntu):
assignee: nobody → Andrea Azzarone (azzar1)
status: Confirmed → In Progress
Launchpad Janitor (janitor) wrote :

This bug was fixed in the package unity - 7.5.0+17.10.20170925.1-0ubuntu1

unity (7.5.0+17.10.20170925.1-0ubuntu1) artful; urgency=medium

  [ Andrea Azzarone ]
  * Fix build issues with gcc-7 and g++-7
  * Refactor the way UserAuthenticator is created and passed around.
    Handle failures to create new threads and fallback to a "Switch to
    greeter..." button in case of failure. (LP: #1311316)
  * Wait until the color buffer is cleared before suspending. (LP:

  [ Marco Trevisan (Treviño) ]
  * Tests: split unit tests in single binaries, enable unstable tests
  * debian/rules: ignore warnings in armhf and ppc64el

 -- Marco Trevisan (Treviño) <> Mon, 25 Sep 2017 16:05:06 +0000

Changed in unity (Ubuntu):
status: In Progress → Fix Released
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