No password field appears after wake from sleep

[Robert Tuck]

To reproduce, close laptop lid and allow to go to sleep. Some time later, open laptop lid. No password field appears and I can't unlock the screen, see attached screenshot. This only happens sometimes (maybe one in ten or fewer?). It seems very similar to another bug which is allegedly fixed, so I have raised this one.

The mouse cursor moves. Ctrl-Alt-F1 to a terminal and sudo services restart lightdm restarts X but still results in no password field.

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: unity 7.3.2+15.04.20150420-0ubuntu1
ProcVersionSignature: Ubuntu 3.19.0-15.15-generic 3.19.3
Uname: Linux 3.19.0-15-generic x86_64
ApportVersion: 2.17.2-0ubuntu1
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CurrentDesktop: Unity
Date: Wed May 6 09:32:46 2015
InstallationDate: Installed on 2015-04-05 (30 days ago)
InstallationMedia: Ubuntu 14.10 "Utopic Unicorn" - Release amd64 (20141022.1)
SourcePackage: unity
UpgradeStatus: Upgraded to vivid on 2015-04-23 (12 days ago)

[Robert Tuck (robt-majormajor)]

Bug seems similar to https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1311316 which is supposed to be fixed.

[Marco Trevisan (Treviño) (3v1n0)]

I can't reproduce this, do you get this on regular basis?

However the problem looks different, as you don't either get the panel showing in your lockscreen.

[Launchpad Janitor (janitor)]

[Expired for unity (Ubuntu) because there has been no activity for 60 days.]