Sorry, not sure how to edit my last comment: I'm using an GeForce 630M.
Not sure if this helps, but it's strictly a visual freeze. The system will recognize inputs after the "freeze" -- the screen just doesn't update until you switch back and forth from the virtual terminals.
Sorry, not sure how to edit my last comment: I'm using an GeForce 630M.
Not sure if this helps, but it's strictly a visual freeze. The system will recognize inputs after the "freeze" -- the screen just doesn't update until you switch back and forth from the virtual terminals.
Hopefully that will help you debug the problem.