I have experienced three freezes *today*, on 3.5.0-5.5 and 3.2.0-28.44.
Then I remembered something: when Intel SNA support first started
appearing in Intel Graphics drivers for Linux back in 11.10 days in the
Xorg-Edgers/Sarvatt PPA, there were various reports of SNA not working
on some hardware configs. Current Intel drivers include SNA support by
default. So about an hour ago I created an /etc/X11/xorg.conf file with
the following contents:

Section "Device"
   Identifier  "Intel Graphics"
   Driver      "intel"
   #Option      "AccelMethod"  "sna"
   Option      "AccelMethod"  "uxa"
   #Option      "AccelMethod"  "xaa"
EndSection

This reverts the driver to the older UXA acceleration method, which I
verified in Xorg.0.log:

[     4.784] (**) intel(0): Option "AccelMethod" "uxa"

So far, no freeze after doing this. While I am loathe to toss up yet
another experiment, it appears that this one is at least worth
reporting, should others wish to try it.

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https://bugs.launchpad.net/bugs/999910

Title:
  [IVB]12.04 64 bit System freezes (mouse, keyboard)

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