And more. Different output of the command: cat
/sys/kernel/debug/vgaswitcheroo/switch

nouveau driver:
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :DynOff:0000:01:00.0

nvidia 390.48, after prime-select intel:
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0

You can see the different status of the discrete card. When "DunOff" it
really disconnected from the power supply, and in case of "Off" it
continues to consume energy.

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You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to nvidia-settings in Ubuntu.
https://bugs.launchpad.net/bugs/1757180

Title:
  nvidia-prime can't switch off the discrete GPU

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/nvidia-prime/+bug/1757180/+subscriptions

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