linux-kernel - Re: Misidentification and failing revalidations of ide dvd-roms with libata

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Message-Id: <200807272147.42264.alistair@devzero.co.uk>
Date:	Sun, 27 Jul 2008 21:47:42 +0100
From:	Alistair John Strachan <alistair@...zero.co.uk>
To:	Simen Timian Thoresen <simentt@...phinics.no>
Cc:	Alan Cox <alan@...rguk.ukuu.org.uk>, linux-kernel@...r.kernel.org
Subject: Re: Misidentification and failing revalidations of ide dvd-roms with libata

On Sunday 27 July 2008 20:33:21 Simen Timian Thoresen wrote:
[snip]
> I've spent a few hours more looking into this, and I'm not really
> getting much clearer;
>
> I've run either and both of the two DVDroms on an external power-supply
> (drive-power from a jumped, believed good ATX-PSU), and the the symptoms
> remain; inconsistent capabilities reported at boot, and when I start
> ripping CDs, one of them will fail as above.
>
> As I still have the impression that this started when I switched distros
> (ie went from CentOS4 2.6.9 pre-libata-kernel to the current Ubuntu 8.04
> 2.6.24-kernel), I've now started playing around with the libata module
> parameters.

If it's not power then I'm still with Alan re the cables. Maybe you have very 
long cables?

I used Alan's nForce4 pata driver for a year or so and didn't have any 
problems. OTOH maybe at this stage it's worth checking whether amd74xx (old 
IDE) breaks in similar ways?

Also, I assume you've memtest86'ed the machine?

-- 
Cheers,
Alistair.
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