More info:
 * ubuntu-driver install did not install nvidia-dkms-440 (had to be installed 
by hand)
 * Upon boot, /sys/bus/pci/devices/0000:01:00.0/power/control is set to `auto`, 
but the GPU is powered on. Setting it to `on` then to `auto` again powers down 
the GPU.
 * This temporary fix above survives suspend/resume

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https://bugs.launchpad.net/bugs/1877727

Title:
  Nvidia dGPU active despite prime-select set to Intel card

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