Date: Fri, 9 Feb 2007 20:16:08 +0000
From: Alan <alan@lxorguk.ukuu.org.uk>
To: Robert Hancock <hancockr@shaw.ca>
Cc: linux-kernel <linux-kernel@vger.kernel.org>, Luigi Genoni <genoni@sns.it>
Subject: Re: [BUG?] ata disk running maximum at DMA33 with 2.6.20 and new
 pata driver, NV CK804 ide controller.
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In-Reply-To: <45CAA8EA.2010505@shaw.ca>
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> As an aside to this sort of problem, shouldn't we print some kind of 
> loud message in dmesg when we force a high-UDMA-capable device down to 
> UDMA33 due to a 40-wire cable detection? In the case where it truly is a 
> 40-wire cable the user may want to know that and replace the cable, if 
> it isn't it gives more of a hint of why the drive isn't running at full 
> speed..

Send patches. We also probably want to change speed straight from
UDMAlots to UDMA33 if the cable is CBL_UNK so that we can rapidly recover
in the cases where the controller says "I'm crap I don't really know" (eg
ATI and Nvidia without ACPI)
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