OK, here is what I obtained. Hope this helps :)
** Attachment added: "current-trace.txt"
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/1142733/+attachment/3680175/+files/current-trace.txt
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Bug
I have the same issue and card and managed to get the latest nvidia
(beta) driver 319.17 running, however with no screen output in X.
Maarten, what do I need to do once your script spawns the shell? just
startx and kill the process or is there more to it? I would be glad to
provide the information