From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: no dma support dvd-rom toughbook cf-y5 ata_piix Date: Fri, 12 Jun 2009 00:54:39 -0600 Message-ID: <4A31FBAF.8010605@gmail.com> References: <1244700488.4142.3.camel@crystal> 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 ([74.125.46.31]:42726 "EHLO yw-out-2324.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753141AbZFLGyk (ORCPT ); Fri, 12 Jun 2009 02:54:40 -0400 Received: by yw-out-2324.google.com with SMTP id 5so1363521ywb.1 for ; Thu, 11 Jun 2009 23:54:42 -0700 (PDT) In-Reply-To: <1244700488.4142.3.camel@crystal> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: discord@u.washington.edu Cc: linux-ide@vger.kernel.org On 06/11/2009 12:08 AM, Colin Williams wrote: > I filed a bug on ubuntu launchpad > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/357531. > > Is it indeed a bug? Is their some kind of module flag or patch? Is their > a way to enable dma on my dvd-rom? I'd love to watch dvd's on my laptop > can one of module developers give me some insight? Doesn't look like the DVD-ROM is connected via PATA or SATA, looks like it's actually connected via a USB connection internally? That seems a bit bizarre.. Can you do a lsusb to verify if that's the case? If it is, then the kernel doesn't have any control over the DMA state of the drive, as that's purely under control of the USB-to-ATA bridge chip they're presumably using.