Very odd, this is what happens
prior to and directly after installing the nvidia drivers this is shown & as 
expected. Also after purging nvidia* & rebooting - 

$ sudo lshw -c display
[sudo] password for doug: 
  *-display               
       description: VGA compatible controller
       product: Sky Lake Integrated Graphics
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 07
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915_bpo latency=0
       resources: irq:130 memory:92000000-92ffffff memory:a0000000-afffffff 
ioport:6000(size=64)
  *-display UNCLAIMED
       description: 3D controller
       product: GM108M [GeForce 940M]
       vendor: NVIDIA Corporation
       physical id: 0
       bus info: pci@0000:01:00.0
       version: a2
       width: 64 bits
       clock: 33MHz
       capabilities: pm msi pciexpress bus_master cap_list
       configuration: latency=0
       resources: memory:93000000-93ffffff memory:80000000-8fffffff 
memory:90000000-91ffffff ioport:5000(size=128)

Once I reboot after the driver install & also  after returning to intel via a 
tty with sudo prime-select intel- 
sudo lshw -c display
[sudo] password for doug: 
  *-display               
       description: VGA compatible controller
       product: Sky Lake Integrated Graphics
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 07
       width: 64 bits
       clock: 33MHz
       capabilities: pciexpress msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915_bpo latency=0
       resources: irq:130 memory:92000000-92ffffff memory:a0000000-afffffff 
ioport:6000(size=64)

So once I reboot with nvidia drivers installed the device 'disappears' &
doesn't 'return' until the drivers are removed & a reboot

The update-alternatives would be /usr/lib/nvidia-361/ld.so.conf

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https://bugs.launchpad.net/bugs/1565516

Title:
  Fails with skylake & nvidia 940m, removes xorg.conf boot up/log in
  fail

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