It's most probably due to this mesa bug:
https://bugs.edge.launchpad.net/ubuntu/+source/mesa/+bug/638725
Feel free to re-open if the upcoming mesa fix doesn't solve the problem.
** Changed in: unity (Ubuntu)
Status: New => Invalid
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choosing netbook for login session results in a blank white screen
https://bugs.launchpad.net/bugs/638725
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