This bug no longer reproduces. I still have ubuntu 12.04 LTS and the
same machine, but I reinstalled it a few months after I submitted this
bug.

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https://bugs.launchpad.net/bugs/1164428

Title:
  [ivb + nvidia] Ubuntu 12.04 LTS complete freeze

Status in “xorg” package in Ubuntu:
  Incomplete

Bug description:
  I've read a few similar bugs reported, but none of them were resolved
  or were putted in an incomplete status.

  I have Ubuntu 12.04 LTS and it freezes all of a sudden. 
  The keyboard/mouse stop working. 
  Can't open any other TTY.
  The only solution is a hard reboot from button.

  Configuration:
  Description:  Ubuntu 12.04.2 LTS
  Release:      12.04
  Lenovo ThinkPad Edge Laptop
  Intel® Core™ i5-3210M CPU @ 2.50GHz × 2 
  OS-type: 32-bit
  4GB RAM
  VGA compatible controller: Intel Corporation Ivy Bridge Graphics Controller 
(rev 09)
  VGA compatible controller: NVIDIA Corporation Device 0de9 (rev a1)

  I have installed on it a basic LAMP configuration, plus netbeans 7.2, 
FileZilla 3.5.3, Google Chrome.
  I also have an external monitor (I mention it because there was another bug 
similar that was saying that the monitor is the problem, but mine freezes 
regardless if I use or not the monitor)

  I don't think there are any logs as the system freezes without any
  warning (no CPU overheating, no lag...)

  It doesn't matter how many programs I have opened, because it freezes
  even if I close all programs, or even if I have Netbeans, Chrome(10+
  tabs +youtube), FileZilla, messenger, libre office, remmina and music
  on all in the same time.

  Sometimes it crashes as soon as I start using a program, other times
  crashes 2,3 times one after another on restart, and other times it
  doesn't crash for days (the longest period without a crash is for 3-4
  days).

  
  What is even more strange is that I have another laptop with Ubuntu ( a Dell 
Inspiron), with same software configuration and external monitor, and it never 
crashed.

  The only software difference is that the one that doesn't crash I
  downloaded the OS from ubuntu.com, and for the one that crashes I took
  the OS from a Romanian proxy. Could these be the issue?

  Please tell what log files to upload that may be of any help.

  Thanks,
  Stefan

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