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Date: Wed, 4 Mar 2009 13:29:45 +0000
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
To: Tejun Heo <tj@kernel.org>
Cc: Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
       the arch/x86 maintainers <x86@kernel.org>,
       Thomas Gleixner <tglx@linutronix.de>, "H. Peter Anvin" <hpa@zytor.com>,
       Ingo Molnar <mingo@elte.hu>, pgnet.trash@gmail.com
Subject: Re: [PATCH 2.6.29-rc7 2/2] x86: disallow DAC for MCP51 PCI bridge
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> x86 is blacklisting DAC for everything VIA. :-)

I'd assume that comes from published docs given VIA actually publish
stuff if you ask nicely.
> 
> * MCP51 is a very old chipset at this point (it's circa 2005).  Not
>   many machine would be running with >4GB memory to begin with.
> 
> * Given the above and scarcity of DAC on most end user machines
>   (nothing on MCP51 does DAC by default), lack of reports isn't too
>   surprising.
> 
> * The board doesn't have a 64bit connector.  It can't be dodgy
>   connector and sil24 is known to behave well with DAC.  The failure
>   being specific to the particular machine doesn't seem likely.
> 
> I'll ping nvidia about it but I think your bar is too high.

I don't think wanting to see *two* examples is a high bar.