From mboxrd@z Thu Jan  1 00:00:00 1970
From: Alan Cox <alan@lxorguk.ukuu.org.uk>
Subject: Re: Kernel 2.6.30rc7 limits IDE to UDMA33
Date: Fri, 5 Jun 2009 14:21:53 +0100
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To: Grozdan <neutrino8@gmail.com>
Cc: hancockrwd@gmail.com, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org

> older kernels have no problems setting the correct UDMA while 2.6.30
> does have problems. Something must have definitely changed in this
> latest kernel. I'll go dig in my BIOS to see if I may need to
> change/force something.

Unless you can actually work through the various kernels and release
candidates to find the one it changes its basically impossible to tell
what has occurred or why.