DX4000 on UPS

Not sure I googled a bit and some suggest you need software.  Here is a link that suggest shutdown does not work, and the workaround is to select hibernate?  Also has a link for more reading

http://wiert.me/2010/06/24/using-a-usb-connected-apc-ups-with-windows-server-2008-and-vmware-server-2-0/