$ sudo bumblebeed --debug
[ 5342.007894] [DEBUG]bbswitch has been detected.
[ 5342.008068] [INFO]Switching method 'bbswitch' is available and will be used.
[ 5342.008137] [DEBUG]Active configuration:
[ 5342.008178] [DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
[ 5342.008221] [DEBUG] X display: :8
[ 5342.008251] [DEBUG] LD_LIBRARY_PATH: /usr/lib/nvidia-current:/usr/lib32/nvidia-current
[ 5342.008281] [DEBUG] Socket path: /var/run/bumblebee.socket
[ 5342.008309] [DEBUG] pidfile: /var/run/bumblebeed.pid
[ 5342.008340] [DEBUG] xorg.conf file: /etc/bumblebee/xorg.conf.nvidia
[ 5342.008362] [DEBUG] xorg.conf.d dir: /etc/bumblebee/xorg.conf.d
[ 5342.008384] [DEBUG] ModulePath: /usr/lib/nvidia-current/xorg,/usr/lib/xorg/modules
[ 5342.008405] [DEBUG] GID name: bumblebee
[ 5342.008426] [DEBUG] Power method: auto
[ 5342.008454] [DEBUG] Stop X on exit: 1
[ 5342.008465] [DEBUG] Driver: nvidia
[ 5342.008475] [DEBUG] Driver module: nvidia-current
[ 5342.008486] [DEBUG] Card shutdown state: 1
[ 5342.008663] [DEBUG]Process /sbin/modprobe started, PID 5360.
[ 5342.008751] [DEBUG]Hiding stderr for execution of /sbin/modprobe
[ 5342.010266] [DEBUG]SIGCHILD received, but wait failed with No child processes
[ 5342.010313] [ERROR]Module 'nvidia-current' is not found.