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Message #22705
[Bug 1375271] Re: desktop or other past screen contents visible before lockscreen on resume
Let me know if there is any specific testing pattern, video recording,
or config information I could provide that might help.
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https://bugs.launchpad.net/bugs/1375271
Title:
desktop or other past screen contents visible before lockscreen on
resume
Status in Compiz:
New
Status in GNOME Screensaver:
New
Status in Unity:
New
Status in “unity” package in Ubuntu:
New
Bug description:
This appears to be a regression in 14.10 sometime in September 2014.
The behavior appears similar to this bug from 2011:
https://bugs.launchpad.net/unity-2d/+bug/830348
On resume from suspend, screen contents are displayed for a brief time
(perhaps 0.5 to 1 sec) before the lock dialog appears.
These screen contents are not always the desktop or open application
beneath the lock screen. On at least one occasion, the screen showed
content from a full-screen video that had been playing in Firefox some
time before the computer had been suspended: neither the video nor its
underlying tab were open anymore, so the image(s) was likely part of a
buffer somewhere. (Needless to say, if the wrong full-screen video had
been watched, depending on the setting, this could be a quite serious
issue for some users).
I have not exhaustively tested conditions in which this appears.
However, just now, the bug did not appear when keeping the lid open,
suspending, and then resuming with the power button.
But when suspending from menu, closing the lid, then opening the lid
and moving the mouse, the screen displayed contents before showing the
lock dialog. The image displayed was of the desktop (with this bug
reporting window) and showed the "suspend" item in the power menu
being highlighted/clicked.
ProblemType: Bug
DistroRelease: Ubuntu 14.10
Package: unity 7.3.1+14.10.20140915-0ubuntu1
ProcVersionSignature: Ubuntu 3.16.0-18.25-generic 3.16.3
Uname: Linux 3.16.0-18-generic x86_64
ApportVersion: 2.14.7-0ubuntu2
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Mon Sep 29 08:38:57 2014
InstallationDate: Installed on 2014-08-10 (50 days ago)
InstallationMedia: Ubuntu 14.04.1 LTS "Trusty Tahr" - Release amd64 (20140722.2)
SourcePackage: unity
UpgradeStatus: Upgraded to utopic on 2014-08-10 (50 days ago)
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