Automatically Switching of the PC when running "halt -p"

Matthew Seaman m.seaman at
Fri Jun 21 18:02:03 BST 2002

On Fri, Jun 21, 2002 at 05:30:45PM +0100, Lee wrote:

> Does anyone know if FreeBSD-4.6 is configured out of the box to
> automatically shutdown the PC when the "halt -p" command is issues.

Not by default: the apm device isn't enabled in the GENERIC kernel.
> I have ensured that APM is enabled, not sure if this makes any
> difference though.

apm is required so that `halt -p', or preferably `shutdown -p' will be
able to power off your system.  Your machine has to have an APM Bios
for this to work --- which is usually a feature of laptops rather than
ordinary PCs.  Nb. it's better to use `shutdown' rather than `halt' as
that gives any processes running on the machine a chance to shutdown
gracefully and clean up after themselves.


Dr Matthew J Seaman MA, D.Phil.                       26 The Paddocks
                                                      Savill Way
Tel: +44 1628 476614                                  Marlow
Fax: +44 0870 0522645                                 Bucks., SL7 1TH UK

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