Asus ROG Nvidia driver not loaded

I can't get my laptop to use the Nvidia videocard. (Ubuntu 18.04)

Running sudo lshw -C video shows:

  *-display UNCLAIMED       
       description: 3D controller

       product: GP107M [GeForce GTX 1050 Mobile]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a1
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:de000000-deffffff memory:c0000000-cfffffff memory:d0000000-d1ffffff ioport:e000(size=128) memory:df000000-df07ffff

  *-display
       description: VGA compatible controller
       product: Intel Corporation
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 04
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm vga_controller bus_master cap_list rom

       configuration: driver=i915 latency=0
       resources: irq:26 memory:dd000000-ddffffff memory:b0000000-bfffffff ioport:f000(size=64) memory:c0000-dffff

Secure boot has been disabled already. I have the graphics-drivers ppa setup and tried nvidia-390, nvidia-396 and some others.
In the software and updates screen, the drivers tab only lists

NVIDIA Corporation: GP107M [GeForce GTX 1050 Mobile]
    [x] NVIDIA driver metapackage van nvidia-driver-390 gebruiken
    [ ] X.Org X server - Nouveau driver van xserver-xorg-video-nouveau gebruiken

So it doesn't list Intel integrated graphics.

The following file exists:

/etc/modprobe.d/nvidia-graphics-drivers.conf

Are there any things left to try? I've seen a lot of "Driver not loaded" threads already and none of the solutions worked for me.