I have the same problem of power drains even when prime-select is on intel. I know for sure that the nvidia GPU is running because the external HDMI port is working and shouldn't since it's wired to the GPU.
sudo sh -c 'echo auto > /sys/bus/pci/devices/0000\:01\:00.0/power/control'
sudo sh -c "echo "1" > remove"
gives no result on my system (Nvidia Quadro M2000M/Thinkpad P51).
I have the same problem of power drains even when prime-select is on intel. I know for sure that the nvidia GPU is running because the external HDMI port is working and shouldn't since it's wired to the GPU.
sudo sh -c 'echo auto > /sys/bus/ pci/devices/ 0000\:01\ :00.0/power/ control'
sudo sh -c "echo "1" > remove"
gives no result on my system (Nvidia Quadro M2000M/Thinkpad P51).