From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 27 Jun 2001 13:46:42 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 27 Jun 2001 13:46:32 -0400 Received: from ns.virtualhost.dk ([195.184.98.160]:63496 "EHLO virtualhost.dk") by vger.kernel.org with ESMTP id ; Wed, 27 Jun 2001 13:46:24 -0400 Date: Wed, 27 Jun 2001 19:41:27 +0200 From: Jens Axboe To: "Jeffrey W. Baker" Cc: linux-kernel@vger.kernel.org Subject: Re: How to change DVD-ROM speed? Message-ID: <20010627194127.H17905@suse.de> In-Reply-To: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Wed, Jun 27 2001, Jeffrey W. Baker wrote: > I am trying to change the spin rate of my IDE DVD-ROM drive. My system is > an Apple PowerBook G4, and I am using kernel 2.4. I want the drive to > spin at 1X when I watch movies. Currently, it spins at its highest speed, > which is very loud and a large power load. > > /proc/sys/dev/cdrom/info indicates that the speed of the drive can be > changed. I use hdparm -E 1 /dev/dvd to attempt to set the speed, and it > reports success. However, the drive continues to spin at its highest > speed. Linux still uses the old-style SET_SPEED command, which is probably not supported correctly by your newer drive. Just checking, I see latest Mt Fuji only lists it for CD-RW. For DVD, we're supposed to do SET_STREAMING to specify such requirements. Feel free to implement it :-) -- Jens Axboe