To manually disable you discrete graphics card:
sudo systemctl disable nvidia-fallback
sudo -s
root@system: 
modprobe -r nvidia && modprobe bbswitch && echo "OFF">/proc/acpi/bbswitch && 
logger Nvidia OFF

the last set of commands have to be re-entered after reboot but it gets
the job done for now.

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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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