The backlight device only gets registered after it's opened by graphical

And the backlight gets unregistered when graphical session stops, hence
when systemd-backight@.service's "" triggers,
the backlight is already gone so the brightness wasn't saved.

Since it's not saved, the backlight won't be restored for next boot.

The easiest approach is to let nvidia driver always registers the
backlight device.

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  systemd-backlight does not save and restore brightness for nvidia

Status in nvidia-graphics-drivers package in Ubuntu:
Status in nvidia-graphics-drivers-418 package in Ubuntu:
Status in nvidia-settings package in Ubuntu:
Status in systemd package in Ubuntu:

Bug description:
  Running nvidia gtx 1080 graphics card, with proprietary nvidia drivers
  on ubuntu 19.04. I can change screen brightness from 0% to 100% in 5%
  steps. However, after a reboot or after a shutdown, brightness level
  reverts to 100%. Please fix to is "remembers" the current brightness
  value at shutdown time, like in does Windows.

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