*** This bug is a duplicate of bug 1280300 ***
https://bugs.launchpad.net/bugs/1280300
The issue still persists in Ubuntu 20.04. Running mate with lightdm and
light-locker configured to lock-on-suspend enabled. After resuming, the
desktop contents before suspend are visible for roughly 5 seconds,
before the lock screen appears.
As this is absolutely unacceptable in terms of security and privacy, I'm
using the following script to suspend (thanks to gethin for the
pointer!):
#!/bin/bash
mate-screensaver-command -l
systemctl suspend
--
You received this bug notification because you are a member of DX
Packages, which is subscribed to unity-2d in Ubuntu.
https://bugs.launchpad.net/bugs/830348
Title:
desktop contents briefly visible on resume from suspend before lock
dialog
Status in Compiz:
New
Status in unity-2d:
Confirmed
Status in gnome-screensaver package in Ubuntu:
Incomplete
Status in i3-wm package in Ubuntu:
Confirmed
Status in unity-2d package in Ubuntu:
Confirmed
Bug description:
This seems like a recent regression on Oneiric (or perhaps I haven't
noticed it before):
On resume from suspend, the contents of the desktop are often briefly
visible before being hidden behind the lock screen. This is a
security problem if there happens to be sensitive information on the
screen.
=====Analysis from mdeslaur=====
This is likely what happens:
1- Something grabs mouse: ie: virtual machine window, or GTK menu in an
application or an indicator
2- Screensaver attempts to start, but cannot get exclusive lock on mouse
3- DPMS turns monitor black
4- User moves mouse, which turns the screen back on
5- Mouse movement causes mouse to get ungrabbed by vm window or gtk menu
6- Screensaver can now grab mouse, and starts
This is all related to the fact that X does not have an API that will
let the screensaver tell an application to release mouse and keyboard
grabs.
To manage notifications about this bug go to:
https://bugs.launchpad.net/compiz/+bug/830348/+subscriptions
--
Mailing list: https://launchpad.net/~dx-packages
Post to : dx-packages@lists.launchpad.net
Unsubscribe : https://launchpad.net/~dx-packages
More help : https://help.launchpad.net/ListHelp
