Unity sometimes freezes after wake up from suspend

[Péter Trombitás]

I couldn't find anything that can cause this, it is completely occasional.
I use Ubuntu 12.04.2 64bit.
Sometimes if I open my laptop's lid to wake it up from suspend, my whole desktop freezes. I'm reporting this to unity because with any other DE it doesn't happen (not even with unity-2d).
In my case, after waking up from suspend, I can see the screen's lats state for like a second, with a notification saying "disconnected from network", but in normal cases, that notification disappears and then everything starts to work, for example nm-applet connects to the wifi-network again etc. But in some cases, the desktop freezes with that first notification on it. Sometimes I cannot even switch to tty1. But when I can, an "export DISPLAY=:0; unity --replace" doesn't help, only a sudo restart lightdm 'solves' the issue.
No matter what kernel I boot (3.2 or 3.5), this happens sometimes.

Sorry if it turns out that this is not related to unity, but that would be my best guess.

Thank you in advance!

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.18.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.5.0-28.47~precise1-generic 3.5.7.9
Uname: Linux 3.5.0-28-generic x86_64
ApportVersion: 2.0.1-0ubuntu17.2
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,regex,animation,resize,place,snap,vpswitch,mousepoll,imgpng,grid,expo,gnomecompat,ezoom,wall,workarounds,unitymtgrabhandles,move,session,fade,scale]
Date: Thu Apr 25 10:56:14 2013
InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1)
MarkForUpload: True
ProcEnviron:
 PATH=(custom, no user)
 LANG=hu_HU.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

[Andrea Azzarone (azzar1)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. We are sorry that we do not always have the capacity to look at all reported bugs in a timely manner. There have been many changes in Ubuntu since that time you reported the bug and your problem may have been fixed with some of the updates. It would help us a lot if you could test it on a currently supported Ubuntu version. When you test it and it is still an issue, kindly upload the updated logs by running apport-collect <bug #> and any other logs that are relevant for this particular issue.

[Launchpad Janitor (janitor)]

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

[Launchpad Janitor (janitor)]

[Expired for Unity because there has been no activity for 60 days.]