From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: SATA: link online but device misclassified Date: Thu, 18 Jun 2009 19:38:16 -0600 Message-ID: <4A3AEC08.4060507@gmail.com> References: <4A308798.6060803@gmail.com> <1244746872.3998.88.camel@mulgrave.site> <1245165697.3965.40.camel@mulgrave.site> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from yw-out-2324.google.com ([74.125.46.29]:35195 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751075AbZFSBhz (ORCPT ); Thu, 18 Jun 2009 21:37:55 -0400 Received: by yw-out-2324.google.com with SMTP id 5so821593ywb.1 for ; Thu, 18 Jun 2009 18:37:57 -0700 (PDT) In-Reply-To: <1245165697.3965.40.camel@mulgrave.site> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: James Bottomley Cc: Marc Bowes , linux-ide@vger.kernel.org On 06/16/2009 09:21 AM, James Bottomley wrote: > On Tue, 2009-06-16 at 17:03 +0200, Marc Bowes wrote: >> Sorry to bother, but this is really bugging me! I can't seem to find anybody >> else with the same problem. What steps should I be taking to figure this >> out? I'm thinking I should be trying other kernel versions and/or plugging >> drives in different places. I don't think the motherboard is faulty, and I >> seem to be getting good speeds (~70mbs) to all four drives. > > Well, those are on the AHCI built in controller. The one with the slow > response is the empty JMicron 20360/20363. But why this should be so, > I've no idea ... it looks like the AHCI driver can't tell the phys are > empty for some reason, which could be due to many things. I would suspect it's a hardware problem that we can't do much about.. For some reason the controller is reporting the SATA link is online at 3Gbps when there's actually nothing connected. We try to repeatedly reset the "device" as it doesn't respond properly, until we finally give up. Can you disable that JMicron controller in the BIOS somehow?