I've a similar problem.
no Error message in Log Report, or error message on screen, simply everything 
freeze. 
Mouse e keyboard do not work (caplock or numlock doesn't activate the 
corresponding LED) and I can't use the terminale during these freeze
I need to force the shutdown using the power key.
this problem always occur immediately after the user login and some time when I 
launch Firefox 
I have an Acer Extensa 5635z:
Pentium(R) Dual-Core CPU T4300 @ 2.10GHz × 2 
Mobile Intel® GM45 Express Chipset
Ubuntu 13.04 64

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https://bugs.launchpad.net/bugs/1173581

Title:
  Ubuntu 13.04 full system crash/kernel panic

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