From mboxrd@z Thu Jan 1 00:00:00 1970 From: Grozdan Subject: Re: Kernel 2.6.30rc7 limits IDE to UDMA33 Date: Fri, 5 Jun 2009 14:43:51 +0200 Message-ID: References: <20090603131407.57c490ed@lxorguk.ukuu.org.uk> <20090603140140.491a8ea8@lxorguk.ukuu.org.uk> <20090605100505.41b3b818@lxorguk.ukuu.org.uk> <20090605114245.175499e1@lxorguk.ukuu.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Received: from mail-ew0-f210.google.com ([209.85.219.210]:63265 "EHLO mail-ew0-f210.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751088AbZFEMnv convert rfc822-to-8bit (ORCPT ); Fri, 5 Jun 2009 08:43:51 -0400 In-Reply-To: <20090605114245.175499e1@lxorguk.ukuu.org.uk> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Alan Cox Cc: hancockrwd@gmail.com, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org 2009/6/5 Alan Cox : >> I've relayed your reply to the pata_amd user on the forum. As for my >> case with pata_via, until this is fixed, is there any way to force i= t >> to use a higher UDMA? Is there a flag that can be passed in, for > > In your case given the BIOS appears to be informing us you have a 40w= ire > cable there isn't much that can be fixed > >> example, in /sys somewhere? hdparm fails to set a higher UDMA and I >> looked at sdparm but don't see anything in it to increase UDMA... > > Tejun some time ago added stuff to override all of these things: > > See Documentation/kernel-parameters.txt > > =A0 =A0 =A0 =A0libata.force=3D > > which will let you override all sorts of autodetection for quirky boa= rds > Thanks, I will try out the kernel params. However, I still wonder why 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.