*** This bug is a duplicate of bug 1280300 ***
https://bugs.launchpad.net/bugs/1280300
Same observed here with 15.10. I consider this as a security concern, too. You
may try:
gsettings set org.gnome.desktop.screensaver ubuntu-lock-on-suspend 'true'
It worked for me
Kind regards
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You received this bug notification because you are a member of Desktop
Packages, which is subscribed to gnome-screensaver 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 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.
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