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[teo1978 <teo8976@xxxxxxxxx>]

I guess it isn't. Long time since the last time I observed it.

Btw, I hadn't realized but this was probably a duplicate of #1165767

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https://bugs.launchpad.net/bugs/1134357

Title:
  At random times whole system hangs; on occasions Ctrl+Alt+F1 followed
  by Ctrl+Alt+F7 fixes it, other times have to do hardware power off

Status in Unity:
  Incomplete
Status in unity package in Ubuntu:
  Incomplete

Bug description:
  I clicked on the Thunderbird launcher icon in the launcher, and the whole system hanged and stopped responding.
  The cursor still kept moving with the movements of the mouse (it got stuck every once in a while), though the cursor arrow graphics got corrupted, but I couldn't click on anything.
  Keyboard didn't work too: I tried alt+tab and even ctrl+alt+F1 to access a virtual terminal, but keyboard input didn't produce any effect.
  CPU consumption was high, or at least the cooler fan was running fast.

  I had no choice but to force a power down.

  
  After that, after a new fresh boot, I clicked the Thunderbird launcher icon again and the same happened again!!!! There's probably some bug in Thunderbird triggering this, but if a single program can hang the whole system in an unrecoverable way something's wrong in either Unity, Xorg or Linux.

  This second time, I was able to switch to a virtual terminal with Ctlr+Alt+F1. Then I went back to normal screen with Ctrl+Alt+F7 and it fixed the issue!!!!!! (without doing anything from the terminal).
  After this, everything behaved as if the Tab key of the keyboard was continuously pressed (which it wasn't, ovbviously) and this got fixed by actually pressing and releasing it. (I guess when the system was not responding, the key press was received and the key released was not processed; this must never ever happen no matter how hanged the cpu is).

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: unity 6.12.0-0ubuntu0.2
  ProcVersionSignature: Ubuntu 3.5.0-25.38-generic 3.5.7.4
  Uname: Linux 3.5.0-25-generic i686
  NonfreeKernelModules: nvidia
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  CompizPlugins: [core,composite,opengl,decor,vpswitch,mousepoll,compiztoolbox,snap,commands,place,resize,session,regex,grid,wall,move,gnomecompat,imgpng,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
  Date: Wed Feb 27 14:24:00 2013
  InstallationDate: Installed on 2010-06-23 (980 days ago)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release i386 (20100429)
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: unity
  UpgradeStatus: Upgraded to quantal on 2013-01-13 (45 days ago)

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