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From: Jung-uk Kim <jkim@FreeBSD.org>
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Date: Mon, 16 Aug 2010 14:30:32 -0400
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Cc: Christian Zander <czander@nvidia.com>, Oleg Sharoyko <osharoiko@gmail.com>
Subject: Re: PCI config space is not restored upon resume (macbook pro)
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On Monday 16 August 2010 02:21 pm, Jung-uk Kim wrote:
> On Monday 16 August 2010 12:46 pm, Oleg Sharoyko wrote:
> > On 6 August 2010 08:15, Oleg Sharoyko <osharoiko@gmail.com> wrote:
> > >> When using the NVIDIA driver, you will need to make sure that
> > >> you're using 256.44, you'll need to be running X at the time
> > >> of entry to S3/S4, and you'll need to make sure you've
> > >> switched away from X's VT (this didn't happen automatically on
> > >> FreeBSD last time I checked).
> > >
> > > I'll give 256.44 a try, but at first I'll try to fix bios
> > > emulation issues.
> >
> > Sorry for a long delay - it has been a really busy week here. It
> > does indeed works with 256.44 just the way you describe. Though I
> > had a couple of strange lockups of ACPI subsystem, but I haven't
> > had enough time to debug them. I guess other drivers could also
> > work if only this wasn't a MacBook. FreeBSD can call BIOS reset,
> > but it looks like this doesn't work with MacBook as it has no
> > BIOS, and would require to copy video card BIOS into memory and
> > execute it in emulation mode. I've seen such a code for linux
> > loader (to boot linux in non-emulation mode), but I don't think
> > it worth doing this on resume.
>
> I am glad to hear it helped. :-)
>
> In theory, we can shadow video ROM and execute it in emulation
> *iff* it actually contains x86 real mode code.  It won't be too
> hard but I am not sure whether it is worth trying.  Are you sure
> the option ROM is actually real mode code but not shadowed again
> after resume?  FYI, you can add a printf() in sys/dev/fb/vesa.c
> like this to verify, I think:
>
> 	if (x86bios_get_orm(0xc0000) == NULL) {
> 		printf("No option ROM found\n");
> 		return (1);
> 	}

I forgot "where" to add it.  It's in vesa_bios_post().  You need to 
replace:

	if (x86bios_get_orm(0xc0000) == NULL)
		return (1);

with the above three lines.

Just in case. :-)

Jung-uk Kim