Public bug reported:

Hello,

After the last update of saucy (with -proposed), I noticed that in some
cases the display freezes while flickering. This flickering lasts a
little moment, but is bothersome and is 100% reproducible.

I've uncovered these two ways to reproduce this

  1. On Firefox, start a flash video and wait for the screen to dim.
  2. Install chromium-bsu (the game) and destroy an enemy ship.

I did uninstall u-s-c in order to see if the bug was still reproducible
and no, it disappeared after uninstalling u-s-c.

My processor is an Intel Core Duo with 945GM.

Description:    Ubuntu Saucy Salamander (development branch)
Release:        13.10

unity-system-compositor:
  Installed: 0.0.1+13.10.20130926.1-0ubuntu1
  Candidate: 0.0.1+13.10.20130926.1-0ubuntu1
  Version table:
 *** 0.0.1+13.10.20130926.1-0ubuntu1 0
        500 http://us.archive.ubuntu.com/ubuntu/ saucy/universe i386 Packages
        100 /var/lib/dpkg/status

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: unity-system-compositor 0.0.1+13.10.20130926.1-0ubuntu1
ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
Uname: Linux 3.11.0-8-generic i686
ApportVersion: 2.12.5-0ubuntu1
Architecture: i386
Date: Fri Sep 27 12:55:37 2013
GraphicsCard:
 Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics 
Controller [8086:27a2] (rev 03) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Device [103c:30a2]
   Subsystem: Hewlett-Packard Company Device [103c:30a2]
InstallationDate: Installed on 2013-08-31 (26 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha i386 (20130830)
MarkForUpload: True
SourcePackage: unity-system-compositor
UnitySystemCompositorLogOld: ** (lightdm:1091): WARNING **: Error executing 
child process unity-system-compositor.sleep: No such file or directory
UpgradeStatus: No upgrade log present (probably fresh install)
version.libdrm: libdrm2 2.4.46-1
version.lightdm: lightdm 1.7.17-0ubuntu1
version.mesa: libegl1-mesa-dev N/A

** Affects: unity-system-compositor (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apport-bug i386 saucy

** Description changed:

  Hello,
  
  After the last update of saucy (with -proposed), I noticed that in some
  cases the display freezes while flickering. This flickering lasts a
  little moment, but is bothersome and is 100% reproducible.
  
  I've uncovered these two ways to reproduce this
  
-   1. On Firefox, start a flash video and wait for the screen to dim.
-   2. Install chromium-bsu (the game) and destroy an enemy ship.
+   1. On Firefox, start a flash video and wait for the screen to dim.
+   2. Install chromium-bsu (the game) and destroy an enemy ship.
+ 
+ I did uninstall u-s-c in order to see if the bug was still reproducible
+ and no, it disappeared after uninstalling u-s-c.
  
  My processor is an Intel Core Duo with 945GM.
  
  Description:  Ubuntu Saucy Salamander (development branch)
  Release:      13.10
  
  unity-system-compositor:
-   Installed: 0.0.1+13.10.20130926.1-0ubuntu1
-   Candidate: 0.0.1+13.10.20130926.1-0ubuntu1
-   Version table:
-  *** 0.0.1+13.10.20130926.1-0ubuntu1 0
-         500 http://us.archive.ubuntu.com/ubuntu/ saucy/universe i386 Packages
-         100 /var/lib/dpkg/status
+   Installed: 0.0.1+13.10.20130926.1-0ubuntu1
+   Candidate: 0.0.1+13.10.20130926.1-0ubuntu1
+   Version table:
+  *** 0.0.1+13.10.20130926.1-0ubuntu1 0
+         500 http://us.archive.ubuntu.com/ubuntu/ saucy/universe i386 Packages
+         100 /var/lib/dpkg/status
  
  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: unity-system-compositor 0.0.1+13.10.20130926.1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.11.0-8.15-generic 3.11.1
  Uname: Linux 3.11.0-8-generic i686
  ApportVersion: 2.12.5-0ubuntu1
  Architecture: i386
  Date: Fri Sep 27 12:55:37 2013
  GraphicsCard:
-  Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics 
Controller [8086:27a2] (rev 03) (prog-if 00 [VGA controller])
-    Subsystem: Hewlett-Packard Company Device [103c:30a2]
-    Subsystem: Hewlett-Packard Company Device [103c:30a2]
+  Intel Corporation Mobile 945GM/GMS, 943/940GML Express Integrated Graphics 
Controller [8086:27a2] (rev 03) (prog-if 00 [VGA controller])
+    Subsystem: Hewlett-Packard Company Device [103c:30a2]
+    Subsystem: Hewlett-Packard Company Device [103c:30a2]
  InstallationDate: Installed on 2013-08-31 (26 days ago)
  InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Alpha i386 (20130830)
  MarkForUpload: True
  SourcePackage: unity-system-compositor
  UnitySystemCompositorLogOld: ** (lightdm:1091): WARNING **: Error executing 
child process unity-system-compositor.sleep: No such file or directory
  UpgradeStatus: No upgrade log present (probably fresh install)
  version.libdrm: libdrm2 2.4.46-1
  version.lightdm: lightdm 1.7.17-0ubuntu1
  version.mesa: libegl1-mesa-dev N/A

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https://bugs.launchpad.net/bugs/1232141

Title:
  Display freezes and flickers after last upgrade

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