*** This bug is a duplicate of bug 1765363 ***
    https://bugs.launchpad.net/bugs/1765363

With this GRUB in /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT="nouveau.modeset=0"

And script:

#!/bin/bash
echo "Switching off nvidia"
# move from Nvidia to intel graphics (if not already done)
prime-select intel
# switch of power to Nvidia (repeat after each laptop start)
echo "auto" > /sys/bus/pci/devices/0000\:01\:00.0/power/control

It Nvidia powers down on my Dell XPS15 9560

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https://bugs.launchpad.net/bugs/1768003

Title:
  nvidia-prime is no longer able to turn off the discrete GPU

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