This is expected since you're using the modesetting driver and have a
fairly recent Nvidia GPU.

As a workaround/fix please install the official nvidia driver instead:

  sudo apt install nvidia-driver-390

** Package changed: xorg (Ubuntu) => xorg-server (Ubuntu)

** Changed in: xorg-server (Ubuntu)
       Status: New => Won't Fix

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https://bugs.launchpad.net/bugs/1787554

Title:
  my laptop consume much power due to display driver

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