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Message #47383
[Bug 1375271] Re: desktop or other past screen contents visible before lockscreen on resume
Accepted unity into trusty-proposed. The package will build now and be
available at
http://launchpad.net/ubuntu/+source/unity/7.2.4+14.04.20141217-0ubuntu1
in a few hours, and then in the -proposed repository.
Please help us by testing this new package. See
https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to
enable and use -proposed. Your feedback will aid us getting this update
out to other Ubuntu users.
If this package fixes the bug for you, please add a comment to this bug,
mentioning the version of the package you tested, and change the tag
from verification-needed to verification-done. If it does not fix the
bug for you, please add a comment stating that, and change the tag to
verification-failed. In either case, details of your testing will help
us make a better decision.
Further information regarding the verification process can be found at
https://wiki.ubuntu.com/QATeam/PerformingSRUVerification . Thank you in
advance!
** Changed in: unity (Ubuntu Trusty)
Status: New => Fix Committed
** Tags added: verification-needed-trusty
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https://bugs.launchpad.net/bugs/1375271
Title:
desktop or other past screen contents visible before lockscreen on
resume
Status in GNOME Screensaver:
New
Status in Unity:
Fix Committed
Status in Unity 7.2 series:
In Progress
Status in unity package in Ubuntu:
Fix Released
Status in unity source package in Trusty:
Fix Committed
Bug description:
[Impact]
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).
[Test Case]
Suspend and resume the computer (closing the lid or using the session
indicator). Since this problem involves a race condition, it is not
reliably reproducable at will.
[Regression Potential]
This fix unmaps windows when a suspend or shutdown event occurs: it
is possible that the window(s) do not get remapped when a wake event
occurs, or the wake even does not get propagated. This does not
appear to occur in practice.
[Other Info]
The Ubuntu 14.04 LTS SRU was cherry-picked from upstream Unity where
it has been released in the Ubuntu "Vivid Vervet" development release
for a couple of months with no apparent regressions.
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