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

And the backlight gets unregistered when graphical session stops, hence
when systemd-backight@.service's "Conflicts=shutdown.target" 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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https://bugs.launchpad.net/bugs/1840592

Title:
  systemd-backlight does not save and restore brightness for nvidia
  display

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