libata access to pata drives breaks dma/32bit mode?

shirish agarwal shirishag75 at
Mon Apr 30 11:44:34 UTC 2007

> Message: 1
> Date: Sun, 29 Apr 2007 14:43:12 +0100
> From: Matthew Garrett <mjg59 at>
> Subject: Re: libata access to pata drives breaks dma/32bit mode?
> To: ubuntu-devel-discuss at
> Message-ID: <20070429134311.GA15463 at>
> Content-Type: text/plain; charset=us-ascii
> On Fri, Apr 27, 2007 at 03:05:18PM -0400, Phillip Susi wrote:
> > I've been seeing several complaints lately from users who have upgraded
> > to feisty and their ide disks are now being handled by libata.  It seems
> > that hdparm does not work on the devices created by the libata driver,
> > so how are you supposed to enable 32bit and dma transfers?  Several
> > users have been having trouble because they can not find a way to enable
> > them and thus, have poor performance under feisty.
> As has been the case for a long time, the kernel and drive are supposed
> to negotiate the appropriate speeds themselves. If that's not happening,
> please file a bug against the kernel.
> --
> Matthew Garrett | mjg59 at

There is already a bug filed for it. Please see
the only issue is the fix which has been committed has not been released as
of yet. I'm also suffering with this bug :(

          Shirish Agarwal
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