at the end!!! 😁😁, my N54L with DSM 6.2.1U4 it shutdown correctly from the DSM OS  and reboot perfectly.  After differents test I'm not sure what is exactly the real solution:   or it's  the U4 or the ACPI version 1.0.   With 2.0 and 3.0 not works.   My bios version is from 2011 too.   I hope this help to other people.   I've disabled the embedded NIC Port 1 control, too.      
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