freebsd power off automatically

[yew chin]

hello, My name is Chin.
I try to turn off freebsd automatically after the
command "shutdown -p now" or "halt -p"
but after the systerm halt, freebsd won't turn the
machine's power off.
i have to turn off the power manually.
i have read some article about adding apm support in
the freebsd kernel.
But isn't freebsd default kernel has come with apm
enable?
or do i have to enable it manually?
thanks for reading and reply

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