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Date:      Fri, 19 Oct 2012 13:13:14 -0400
From:      John Baldwin <jhb@freebsd.org>
To:        Alberto Villa <avilla@freebsd.org>
Cc:        freebsd-acpi@freebsd.org, Juergen Lock <nox@jelal.kn-bremen.de>, mobile@freebsd.org
Subject:   Re: Dell acpi_video patch
Message-ID:  <201210191313.14246.jhb@freebsd.org>
In-Reply-To: <CAJp7RHac4pUd60LxLqq8exAUgi1ccKG66xS3oLqnsF=5whUUog@mail.gmail.com>
References:  <20121005215316.GA38707@triton8.kn-bremen.de> <201210191053.20041.jhb@freebsd.org> <CAJp7RHac4pUd60LxLqq8exAUgi1ccKG66xS3oLqnsF=5whUUog@mail.gmail.com>

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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



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