From owner-freebsd-current@FreeBSD.ORG  Wed Mar 25 22:33:22 2009
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From: Jung-uk Kim <jkim@FreeBSD.org>
To: Gustau Perez <gperez@entel.upc.edu>
Date: Wed, 25 Mar 2009 18:33:13 -0400
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Subject: Re: [HEADSUP] amd64 suspend/resume code to be comitted
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On Wednesday 25 March 2009 05:28 pm, Gustau Perez wrote:
> > Please try the attached patch, which just disables restoring VGA
> > state while resuming.
>
>   Tried your patch again, and this time using hw.acpi.reset_video,
> hw.acpi.suspend_bounce and friends. The same result, the screen
> remains completely black.
>
>    Before appliying the patch, when resuming the screen showed
> messages about the resume of some hardware (usb, firewire, etc ...)
> and then it went black.
>
>   Is there anything I can test ?

Then, it is something else, e.g., acpi_video(4).  You can try setting 
debug.acpi.disabled="video" in /boot/loader.conf for example.

Jung-uk Kim