sudo systemctl status bumblebeed.service
[sudo] password for yahya: 
● bumblebeed.service - Bumblebee C Daemon
   Loaded: loaded (/usr/lib/systemd/system/bumblebeed.service; enabled; vendo
   Active: active (running) since Fri 2017-12-22 19:11:45 +03; 1h 5min ago
 Main PID: 456 (bumblebeed)
    Tasks: 1 (limit: 4915)
   CGroup: /system.slice/bumblebeed.service
           └─456 /usr/bin/bumblebeed --use-syslog

Ara 22 19:11:45 WAsP systemd[1]: Started Bumblebee C Daemon.
Ara 22 19:11:45 WAsP bumblebeed[456]: /usr/bin/bumblebeed 3.2.1-2017-02-27-Fo
Ara 22 19:17:23 WAsP bumblebeed[456]: Could not load GPU driver
Ara 22 19:17:43 WAsP bumblebeed[456]: Could not load GPU driver

optirun glxspheres32
[ 4037.184136] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver

[ 4037.184186] [ERROR]Aborting because fallback start is disabled.

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