optirun -vv -debug glxspheres
[ 1667.077604] [DEBUG]Reading file: /etc/bumblebee/bumblebee.conf
[ 1667.078166] [INFO]Configured driver: nvidia
[ 1667.078482] [DEBUG]optirun version 3.2.1 starting...
[ 1667.078504] [DEBUG]Active configuration:
[ 1667.078513] [DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
[ 1667.078521] [DEBUG] X display: ebug
[ 1667.078528] [DEBUG] LD_LIBRARY_PATH: /usr/lib/nvidia-340-updates:/usr/lib32/nvidia-340-updates
[ 1667.078536] [DEBUG] Socket path: /var/run/bumblebee.socket
[ 1667.078544] [DEBUG] Accel/display bridge: auto
[ 1667.078560] [DEBUG] VGL Compression: proxy
[ 1667.078589] [DEBUG] VGLrun extra options: 
[ 1667.078602] [DEBUG] Primus LD Path: /usr/lib/x86_64-linux-gnu/primus:/usr/lib/i386-linux-gnu/primus
[ 1667.078672] [DEBUG]Using auto-detected bridge virtualgl
[ 1667.093153] [INFO]Response: No - error: [XORG] (EE) 

[ 1667.093202] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) 

[ 1667.093261] [DEBUG]Socket closed.
[ 1667.093342] [ERROR]Aborting because fallback start is disabled.
[ 1667.093373] [DEBUG]Killing all remaining processes.