Similar here, Lenovo T61:
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960 
Integrated Graphics Controller (primary) (rev 0c)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated 
Graphics Controller (secondary) (rev 0c)

To reconstruct:
1) Start Normal Unity or Gnome session
2) Set screensaver to blank in 1 minute.
3) Put Flash video in firefox
4) Once screen goes blank, immediately wake it with mouse movement.
5) Screen redrawn with last frame before going black (Last frame of full screen 
video for example).
6) Session is dead:
     * Mouse cursor moves.
     * No feedback from mouse or keyboard.
     * No sound.
     * VTs 1-6 works fine, all applications in sessions seems to be alive.

After restarting GDM, everything fine.

Might be related to suspend/resume, can't recall this happening before
first suspend/resume cycle.

** Attachment added: "Xorg.0.log.old"
   
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/763463/+attachment/2084091/+files/Xorg.0.log.old

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https://bugs.launchpad.net/bugs/763463

Title:
  [i865] Xorg freeze (IPEHR: 0x02000011)

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