Prime select is not turning off the dgpu in Ubuntu 20.04

Laptop: MSI GE40
dGPU: GTX 760m
iGPU Intel HD4600

Driver: Nvidia 440 installed via "Additional Drivers" GUI from default
20.04 repos.

When using "prime-select intel" the iGPU is being used however the dGPU
is still powered on resulting in considerably more power usage and heat
generation.

Installing and loading the bbswitch module and running "echo
"OFF">/proc/acpi/bbswitch" does successfully power down the dGPU
drastically lower power usage.

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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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