$ dkms status
bbswitch, 0.7, 3.13.0-12-generic, x86_64: installed
bbswitch, 0.7, 3.13.0-15-generic, x86_64: installed
bbswitch, 0.7, 3.13.0-16-generic, x86_64: installed
nvidia-331, 331.38, 3.13.0-16-generic, x86_64: installed