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

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