Looks like installing latest drm-intel kernel fixes this issue. So this 
probably was fixed upstream. 
Here's some steps to install that kernel: 
http://www.khattam.info/2010/07/13/howto-install-intel-drm-kernel-to-avoid-crashes-on-boards-with-intel-hd/

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[arrandale] Dell Latitude E4310 Dual Monitors freezing
https://bugs.launchpad.net/bugs/591929
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