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0e1f616
(Get the code!)
On my laptop I do *not* have this problem. It has the stable NVIDIA driver from the Ubuntu 14.04 repo, 340.96. My laptop has an NVidia Quadro K2000M.
My office computer *does* have the problem. It also runs Ubuntu 14.04 but has the NVidia driver installed with the NVidia CUDA toolkit, 352.63. It has a GeForce GTX Titan X card.
I suspect there is some other installation problem with the office computer as sometimes when I ask the computer to "lock" it does not. Probably when 16.04 comes out I will try to reinstall the NVIDIA CUDA toolkit from a fresh install.