I've been playing with this, and found forcing a reset of the Xv registers 
after a mode-switch seems to help this problem.

The debdiff, sources and a .deb are at:

http://www2.eng.cam.ac.uk/~pcjc2/ubuntu/

I'm not an Ubuntu or X.Org developer, so treat these as what they are..
unofficial and only tested by myself.

The package also has a possible fix / workaround for LP #127101, the
"grey blocks" crash on VT switch. (I continued from Bryce's fine work
debugging that).

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new Intel driver freezes system on video play after changing to console
https://bugs.launchpad.net/bugs/141063
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