From owner-freebsd-stable@FreeBSD.ORG  Wed Nov 17 03:37:42 2010
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Date: Wed, 17 Nov 2010 14:20:33 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: Bruce Cran <bruce@cran.org.uk>
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Cc: freebsd-multimedia@freebsd.org, freebsd-stable@freebsd.org,
	Lars Engels <lars.engels@0x20.net>, Stefan Walter <stefan@freebsd.org>
Subject: Re: 8.1-RELEASE: snd_hda works as module only, suspend/resume leaves
 display off
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On Tue, 16 Nov 2010, Bruce Cran wrote:
 > On Tue, 16 Nov 2010 21:46:44 +0100
 > Lars Engels <lars.engels@0x20.net> wrote:
 > 
 > > Download && compile the code (gcc -o chvt chvt.c).
 > > Add "$path/$to/chvt 1" to /etc/rc.suspend and "$path/$to/chvt 9" to
 > > /etc/rc.resume, so that your machine automatically changes to ttyv0
 > > before going to sleep and changes back to X after waking up.
 > 
 > The acpi code already does this: if you run acpiconf from within X
 > you'll see ttyv0 appear, the system turns off and when resuming ttyv0
 > appears before X11.

Perhaps this might be one of those machines (I have two) that respond 
positively to setting sysctl hw.syscons.sc_no_suspend_vtswitch=1 ?

cheers, Ian