Solved in recent kernels and/or nvidia drivers

** Changed in: linux (Ubuntu)
       Status: Incomplete => Fix Released

** Changed in: nvidia-graphics-drivers-525 (Ubuntu)
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/2015397

Title:
  [Lenovo Legion 5i pro] 90 second delay during boot (Failed to start
  systemd-backlight@backlight:nvidia_0.service)

Status in linux package in Ubuntu:
  Fix Released
Status in nvidia-graphics-drivers-525 package in Ubuntu:
  Fix Released

Bug description:
  Hi,

  Lunar, 525.105.17

  I get a very very very slow boot using dynamic graphics in my Lenovo Legion 
5i pro i7/3070 Ti.
  Using discrete graphics is ok.
  Using Nouveau with hybrid graphics is ok.

  After some research, it seems the culprit is:

  Failed to start systemd-backlight@backlight:nvidia_0.service -
  Load/Save Screen Backlight Brightness of backlight:nvidia_0.

  systemd blame:

  1min 34.046s plymouth-quit-wait.service
  1min 30.278s gpu-manager.service

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