On my machine (disco/gnome on Wayland) it also still appears.
But something has changed: a few months ago the screen contents was visible on 
each resume. Now it makes a difference if the computer suspended due to a lack 
of activity (in this case the computer seems to always only lock the screen. A 
few seconds after resuming), due to me pressing the "suspend" key (in this case 
the screen either locks quickly on resume or is already locked in resume) or 
due to closing the laptop lid: in the latter case if I open my laptop the 
screen is already locked 

** Tags added: cosmic disco

** Tags removed: verification-done

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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-shell in Ubuntu.
https://bugs.launchpad.net/bugs/1532508

Title:
  Screen contents revealed briefly on resume, before even unlocking

Status in GNOME Shell:
  In Progress
Status in Ubuntu GNOME:
  Confirmed
Status in gdm3 package in Ubuntu:
  Confirmed
Status in gnome-shell package in Ubuntu:
  Confirmed
Status in unity package in Ubuntu:
  Fix Released
Status in unity source package in Xenial:
  Fix Released
Status in gnome-shell package in Debian:
  Confirmed

Bug description:
  [Impact]

  When lock is enabled, the screen doesn't get blank/covered by
  lockscreen before suspending, thus on early resume the content might
  be shown.

  Video showing the bug: https://youtu.be/dDOgtK1MldI

  Reproduced on Ubuntu 2015.10, Ubuntu 2014.04

  [Test case]

  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

  [Possible Regression]

  Content on screen isn't painted anymore and screen stays black.

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