optirun -vvv glxspheres

[22281.586875] [DEBUG]Reading file: /etc/bumblebee/bumblebee.conf
[22281.587582] [INFO]Configured driver: nvidia
[22281.587984] [DEBUG]optirun version 3.2.1 starting...
[22281.588044] [DEBUG]Active configuration:
[22281.588055] [DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
[22281.588066] [DEBUG] X display: :8
[22281.588076] [DEBUG] LD_LIBRARY_PATH: /usr/lib/nvidia-310:/usr/lib32/nvidia-310
[22281.588086] [DEBUG] Socket path: /var/run/bumblebee.socket
[22281.588096] [DEBUG] Accel/display bridge: auto
[22281.588106] [DEBUG] VGL Compression: proxy
[22281.588116] [DEBUG] VGLrun extra options:
[22281.588126] [DEBUG] Primus LD Path: /usr/lib/x86_64-linux-gnu/primus:/usr/lib/i386-linux-gnu/primus
[22281.588191] [DEBUG]Using auto-detected bridge virtualgl
[22282.123003] [INFO]Response: No - error: [XORG] (EE) No devices detected.

[22282.123049] [ERROR]Cannot access secondary GPU - error: [XORG] (EE) No devices detected.

[22282.123064] [DEBUG]Socket closed.
[22282.123107] [ERROR]Aborting because fallback start is disabled.
[22282.123121] [DEBUG]Killing all remaining processes.