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From: John Baldwin <jhb@freebsd.org>
To: Alberto Villa <avilla@freebsd.org>
Subject: Re: Dell acpi_video patch
Date: Fri, 19 Oct 2012 13:13:14 -0400
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Cc: freebsd-acpi@freebsd.org, Juergen Lock <nox@jelal.kn-bremen.de>,
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On Friday, October 19, 2012 11:41:56 am Alberto Villa wrote:
> On Fri, Oct 19, 2012 at 4:53 PM, John Baldwin <jhb@freebsd.org> wrote:
> > I'm looking at section B.4.2 in the 3.0b spec, it has a sample _DOD of:
> 
> I've read section B.3.2 of 5.0 spec, which looks the same as 3.0b, but
> my IDs don't have bit 31 set, they have bit 16 (which is the
> difference between _DOD and _ADR you were probably talking about). Or
> am I missing the point?

Yes, unless bit 31 is set, we can't know anything about bits 0-15 except
that they are "unique".  Specifically, we can't look at the "Display Type"
bits to determine if an output device is a CRT vs LCD vs TV, etc.  You
can only do that if bit 31 is set.

-- 
John Baldwin