Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756589AbYHMObT (ORCPT ); Wed, 13 Aug 2008 10:31:19 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754434AbYHMObG (ORCPT ); Wed, 13 Aug 2008 10:31:06 -0400 Received: from iolanthe.rowland.org ([192.131.102.54]:55381 "HELO iolanthe.rowland.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1754095AbYHMObE (ORCPT ); Wed, 13 Aug 2008 10:31:04 -0400 Date: Wed, 13 Aug 2008 10:31:03 -0400 (EDT) From: Alan Stern X-X-Sender: stern@iolanthe.rowland.org To: Pavel Machek cc: kernel list , Linux-pm mailing list , , , Subject: Re: Power management for SCSI In-Reply-To: <20080813095055.GA475@elf.ucw.cz> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1126 Lines: 30 On Wed, 13 Aug 2008, Pavel Machek wrote: > From: Alan Stern > > Add support for autosuspend/autoresume. Lowlevel driver can use it to > spin the disk down and power down its SATA link, to turn off the USB > interface, etc. > > Spinning down the disk is useful - saves ~0.5W here. Powering down > SATA controller is even better -- should save ~1W. > > Now, I guess the patch will need to be split to small pieces for > merge... I tried to rearrange it so that the documentation and hooks > go before stuff that needs the hooks, and before Kconfig enabler. If > it looks reasonably good, I'll split it into smaller pieces. James had a number of objections to my original patch; you can read them here: https://lists.linux-foundation.org/pipermail/linux-pm/2008-March/016849.html I haven't had time yet to work on an improved version. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/