From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S966001AbXCPWjK (ORCPT ); Fri, 16 Mar 2007 18:39:10 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S966002AbXCPWjK (ORCPT ); Fri, 16 Mar 2007 18:39:10 -0400 Received: from sd-green-bigip-83.dreamhost.com ([208.97.132.83]:32840 "EHLO swarthymail-a3.g.dreamhost.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S966001AbXCPWjI (ORCPT ); Fri, 16 Mar 2007 18:39:08 -0400 Date: Fri, 16 Mar 2007 19:39:02 -0300 From: John Coppens To: lsorense@csclub.uwaterloo.ca (Lennart Sorensen) Cc: linux-kernel@vger.kernel.org Subject: Re: Conflict between ide and usb? Message-Id: <20070316193902.d2514865.john@jcoppens.com> In-Reply-To: <20070316203415.GK22466@csclub.uwaterloo.ca> References: <20070316154735.6de11eca.john@jcoppens.com> <75b66ecd0703161252l60dcbd81s3c9beb7cb91b6c14@mail.gmail.com> <20070316171253.2014deaf.john@jcoppens.com> <20070316203415.GK22466@csclub.uwaterloo.ca> X-Mailer: Sylpheed 2.3.1 (GTK+ 2.8.20; i686-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, 16 Mar 2007 16:34:15 -0400 lsorense@csclub.uwaterloo.ca (Lennart Sorensen) wrote: > Do you even have DMA enabled for the DVD drive? Without it it will be > very slow and painful for the CPU. I also have noticed that many fast > (16x) DVD writers must have an 80 wire cable or they won't work > correctly and do nasty things to the system. > > Check /proc/ide/hdX/settings|grep dma and see if it says 1 0 1 or 0 0 1. I _knew_ I enabled the DMA, but it seems that is switches off when I start the transfer: hdc: DMA disabled hdc: ide_intr: huh? expected NULL handler on exit hdc: ATAPI reset complete ISO 9660 Extensions: RRIP_1991A VFS: busy inodes on changed media. This is on hdc, which is the DVD. Harddisk has DMA on. John