I confirm a power usage issue.
Dell 7510 (too !)
Ubuntu (GNOME) 18.04
Nvidia M1000M

I found that the file :
/etc/modprobe.d/blacklist-nvidia.conf
is not removed by prime when switching to Nvidia, so the module cannot be 
loaded (as far I understand the stuff). When I remove it and load with Nvidia 
mode, the Nvidia module is loaded, not the Nouveau module.

The grub option "nouveau.run-pm=0" (or something like that) is either
not removed when purging Nvidia-390 stack. Removing it manually allows
to use Nouveau with normal (low) power usage.

I did not succeed to get a Nvidia-390 with Intel mode AND dGPU powered
off.

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https://bugs.launchpad.net/bugs/1765363

Title:
  prime-select intel is not powering off the nvidia card

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