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[Jim <787349@xxxxxxxxxxxxxxxxxx>]

I've found a potential fix:

-Install Compiz Settings Manager: sudo apt-get install compizconfig-
settings-manager

-Go to OpenGL plug-in & uncheck the Sync to VBlank option.


I am trying a the moment wether this may work or not :) but it seems that it has worked for others. I forgot to mention in my previous comment that i was having this problem in Gnome desktop not Unity. For more about this fix check these links:

http://ubuntuforums.org/showpost.php?p=10798466&postcount=50

http://www.preshweb.co.uk/2011/05/ubuntu-11-04-x-freezing-after-
screensaver-active-laptop-lid-closed/

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Packages, which is subscribed to gnome-screensaver in Ubuntu.
https://bugs.launchpad.net/bugs/787349

Title:
  [Natty] Cannot exit screensaver : frozen

Status in “gnome-screensaver” package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: gnome-screensaver

  Noticed recently (but often) on Dell XPS M1330 (Intel graphics), looks
  like a regression :

  - When system has gone to screensaver, then screen turned off, moving
  mouse brings back a screen on which screensaver is static (stopped),
  mouse cursor moving OK, but no password dialog, no way to get out of
  this.

  - Shitfing back and forth to text console and X11 works, text console
  works OK.

  - The screensaver view gives the impression something works and it
  "would want to get out of this"  : Seems to react to typing password
  blindly (disk activity, mouse cursor changes shape) but the
  screensaver static image stays there forever.

  There's absolutely no way to get out of this except for rebooting the
  system completely. (restart gdm isn't enough)

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: gnome-screensaver 2.30.2-0ubuntu2
  ProcVersionSignature: Ubuntu 2.6.38-8.42-generic 2.6.38.2
  Uname: Linux 2.6.38-8-generic i686
  Architecture: i386
  CheckboxSubmission: 1ea6109db29b53f721a523a77b7f3abf
  CheckboxSystem: d00f84de8a555815fa1c4660280da308
  Date: Tue May 24 07:48:47 2011
  EcryptfsInUse: Yes
  GconfGnomeSession:
   idle_delay = 3
    /desktop/gnome/session/required_components:
     windowmanager = gnome-wm
  GnomeSessionIdleInhibited: No
  GnomeSessionInhibitors: None
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  ProcEnviron:
   LANGUAGE=fr_FR:en
   PATH=(custom, user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  SourcePackage: gnome-screensaver
  UpgradeStatus: Upgraded to natty on 2011-04-03 (50 days ago)
  WindowManager: gnome-wm

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