From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Garzik Subject: Re: [PATCH] ahci: disable FPDMA auto-activate optimization on NVIDIA AHCI Date: Wed, 24 Feb 2010 22:45:43 -0500 Message-ID: <4B85F267.8090907@garzik.org> References: <4B5FC213.1060601@gmail.com> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-yw0-f197.google.com ([209.85.211.197]:58888 "EHLO mail-yw0-f197.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932112Ab0BYDpq (ORCPT ); Wed, 24 Feb 2010 22:45:46 -0500 In-Reply-To: <4B5FC213.1060601@gmail.com> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: Robert Hancock Cc: linux-kernel , ide , Mike Cui , Peer Chen On 01/26/2010 11:33 PM, Robert Hancock wrote: > Mike Cui reported that his system with an NVIDIA MCP79 (aka MCP7A) chipset > stopped working with 2.6.32. The problem appears to be that 2.6.32 now enables > the FPDMA auto-activate optimization in the ahci driver. The drive works fine > with this enabled on an Intel AHCI so this appears to be a chipset bug. > Since MCP79 is a fairly recent NVIDIA chipset and we don't have any info on > whether any other NVIDIA chipsets have this issue, disable FPDMA AA optimization > on all NVIDIA AHCI controllers for now. > > Should address http://bugzilla.kernel.org/show_bug.cgi?id=14922 > > Signed-off-by: Robert Hancock > > --- > > Mike, can you test this out and make sure this resolves the problem for you? applied