Public bug reported:

With system monitor running, I got a nasty surprise. The system locked up when 
CPU1 hit 100%. This required a power down reboot after about 30 minutes of no 
response. The screens (3) were still displaying but the mouse keyboard were 
frozen.
I 5s powerred down and rebooted (by the way virtual boc was opening an xp 
virtual at the time. Memory was 17%.
After reboot, I again openned system monitor and downloaded a landrover pdf 
repair manual. The mouse strted creeping around the screen as if someone had a 
very slow remote desktop connection to me. No VM for this part.
Currently after another reboot, I have system monitor open andno issues.

http://www.landroverresource.com/docs/D2_Workshop_Manual.pdf

Now I am trying the same download again but no problem

Now I opened vm xp and still no problem

The problem is gone

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: unity 5.20.0-0ubuntu3
ProcVersionSignature: Ubuntu 3.8.0-37.53~precise1-generic 3.8.13.18
Uname: Linux 3.8.0-37-generic x86_64
NonfreeKernelModules: fglrx
ApportVersion: 2.0.1-0ubuntu17.6
Architecture: amd64
CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
Date: Fri Mar 21 19:06:45 2014
InstallationMedia: Ubuntu 12.04.3 LTS "Precise Pangolin" - Release amd64 
(20130820.1)
MarkForUpload: True
ProcEnviron:
 TERM=xterm
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)

** Affects: unity (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug precise running-unity

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https://bugs.launchpad.net/bugs/1295923

Title:
  System Mouse Lockup

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