Optirun falla en Ubuntu 17.10 con nvidia geforce 940MX

Question

Tengo una computadora portátil con una GPU nVidia Geforce 940MX dedicada. Instalé los paquetes de Bumblebee siguiendo los pasos escritos enhttps://wiki.ubuntu.com/Bumblebeepero cada vez que quiero ejecutar optirun glxgearsfalla con el mensaje

[  663.222353] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver

[  663.222380] [ERROR]Aborting because fallback start is disabled.

Intenté seguir las instrucciones donde /etc/bumblebee/xorg.conf.nvidiadice ingresar el BusID correcto, pero me lspci | egrep 'VGA|3D'da el siguiente resultado 00:02.0 VGA compatible controller: Intel Corporation HD Graphics 620 (rev 02) 01:00.0 3D controller: NVIDIA Corporation Device 179c (rev a2) , que es el mismo BusID que se especifica en el archivo xorg.conf.nvidia. No sé cómo solucionar este problema. En manjaro linux funcionó perfectamente con los controladores propietarios pero en Ubuntu no parece funcionar.

Si alguien está interesado, aquí está mi archivo xorg.conf.nvidia:

Section "ServerLayout"
    Identifier  "Layout0"
    Option      "AutoAddDevices" "false"
    Option      "AutoAddGPU" "false"
EndSection

Section "Device"
    Identifier  "DiscreteNvidia"
    Driver      "nvidia"
    VendorName  "NVIDIA Corporation"

#   If the X server does not automatically detect your VGA device,
#   you can manually set it here.
#   To get the BusID prop, run `lspci | egrep 'VGA|3D'` and input the data
#   as you see in the commented example.
#   This Setting may be needed in some platforms with more than one
#   nvidia card, which may confuse the proprietary driver (e.g.,
#   trying to take ownership of the wrong device). Also needed on Ubuntu 13.04.
    BusID "PCI:01:00:0"

#   Setting ProbeAllGpus to false prevents the new proprietary driver
#   instance spawned to try to control the integrated graphics card,
#   which is already being managed outside bumblebee.
#   This option doesn't hurt and it is required on platforms running
#   more than one nvidia graphics card with the proprietary driver.
#   (E.g. Macbook Pro pre-2010 with nVidia 9400M + 9600M GT).
#   If this option is not set, the new Xorg may blacken the screen and
#   render it unusable (unless you have some way to run killall Xorg).
    Option "ProbeAllGpus" "false"

    Option "NoLogo" "true"
    Option "UseEDID" "false"
    Option "UseDisplayDevice" "none"
EndSection