bumblebee does not work with XPS 9560

I have Debian Sid on my XPS 15 9560, the system informations are like follows:

```
Debian GNU/Linux buster/sid \n \l

Dell Inc.
baseboard-product-name: 05FFDN
baseboard-version : A00
system-manufacturer : Dell Inc.
system-product-name : XPS 15 9560
system-version : Not Specified
bios-vendor : Dell Inc.
bios-version : 1.3.4
bios-release-date : 06/08/2017

optirun (Bumblebee) 3.2.1
```

I have installed the `bumblebee-nvidia` package from the official repository. But when I use `optirun`, the terminal outputs following error:

```
$ optirun -vv glxgears
[ 713.774178] [DEBUG]Reading file: /etc/bumblebee/bumblebee.conf
[ 713.774285] [INFO]Configured driver: nvidia
[ 713.774494] [DEBUG]optirun version 3.2.1 starting...
[ 713.774511] [DEBUG]Active configuration:
[ 713.774513] [DEBUG] bumblebeed config file: /etc/bumblebee/bumblebee.conf
[ 713.774514] [DEBUG] X display: :8
[ 713.774515] [DEBUG] LD_LIBRARY_PATH: /usr/lib/x86_64-linux-gnu/nvidia:/usr/lib/i386-linux-gnu/nvidia:/usr/lib/nvidia
[ 713.774516] [DEBUG] Socket path: /var/run/bumblebee.socket
[ 713.774536] [DEBUG] Accel/display bridge: auto
[ 713.774537] [DEBUG] VGL Compression: proxy
[ 713.774538] [DEBUG] VGLrun extra options:
[ 713.774540] [DEBUG] Primus LD Path: /usr/lib/x86_64-linux-gnu/primus:/usr/lib/i386-linux-gnu/primus:/usr/lib/primus:/usr/lib32/primus
[ 713.774578] [DEBUG]Using auto-detected bridge primus
[ 713.869006] [INFO]Response: No - error: Could not load GPU driver

[ 713.869018] [ERROR]Cannot access secondary GPU - error: Could not load GPU driver

[ 713.869021] [DEBUG]Socket closed.
[ 713.869036] [ERROR]Aborting because fallback start is disabled.
[ 713.869040] [DEBUG]Killing all remaining processes.
```

Then I tried to configure the `KernelDrive` in `/etc/bumblebee/bumblebee.conf`, neither `nvidia` or `nvidia-current` works.

When I run `sudo modprobe nvidia-current`, the error is like this:
```
$ sudo modprobe -vv nvidia-current
modprobe: INFO: ../libkmod/libkmod.c:364 kmod_set_log_fn() custom logging function 0x9820ee7390 registered
insmod /lib/modules/4.11.0-2-amd64/updates/dkms/nvidia-current.ko
modprobe: INFO: ../libkmod/libkmod-module.c:886 kmod_module_insert_module() Failed to insert module '/lib/modules/4.11.0-2-amd64/updates/dkms/nvidia-current.ko': No such device
modprobe: ERROR: could not insert 'nvidia_current': No such device
modprobe: INFO: ../libkmod/libkmod.c:331 kmod_unref() context 0x982129d200 released
```

I have checked the `modules` directory, it contains all `nvidia-current.ko` and `nvidia-current-drm.ko` etc files.

I remember that when Debian was using kernel `linux-image-4.9.0-3-amd64` there weren't any problem, however when it automatically upgrades to `4.11.0-1-amd64` and `4.11.0-2-amd64` then bumblebee produces the error above.

Attached please find the report generated by `bumblebee-bugreport`.