The following packages have unmet dependencies:
 libgl1-nvidia-glx : Depends: nvidia-alternative (= 384.130-1)
                     Depends: libnvidia-glcore (= 384.130-1) but 390.87-8~bpo9+1 is to be installed
                     Recommends: nvidia-kernel-dkms (= 384.130-1) or
                                 nvidia-kernel-384.130
E: Unable to correct problems, you have held broken packages.

Xorg.0.log:

The following packages have unmet dependencies:
 libgl1-nvidia-glx : Depends: nvidia-alternative (= 384.130-1)
                     Depends: libnvidia-glcore (= 384.130-1) but 390.87-8~bpo9+1 is to be installed
                     Recommends: nvidia-kernel-dkms (= 384.130-1) or
                                 nvidia-kernel-384.130
E: Unable to correct problems, you have held broken packages.
...

實際上 remove bumblebee, bumblebee-nvidia, primus 之後，load nvidia_drv.so 就 OK 了。
但是依然沒有畫面。