From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Ganzhorn Subject: Re: [PATCH] AHCI powersaving and port-stopping (2.6.22-rc4) Date: Mon, 11 Jun 2007 13:20:46 +0200 Message-ID: <466D300E.4080201@googlemail.com> References: <873b0yvk14.fsf-genuine-vii@john.fremlin.org> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from ug-out-1314.google.com ([66.249.92.169]:51516 "EHLO ug-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750954AbXFKLUw (ORCPT ); Mon, 11 Jun 2007 07:20:52 -0400 Received: by ug-out-1314.google.com with SMTP id j3so1445125ugf for ; Mon, 11 Jun 2007 04:20:51 -0700 (PDT) In-Reply-To: <873b0yvk14.fsf-genuine-vii@john.fremlin.org> Sender: linux-ide-owner@vger.kernel.org List-Id: linux-ide@vger.kernel.org To: John Fremlin Cc: linux-ide@vger.kernel.org, power@bughost.org What Intel chipsets do include "AHCI chipset"? I guess you are talking about the SATA controller of certain new Intel chipsets, aren't you? Just recently I noticed that my new notebooks SATA controller won't work with the libata Intel ICH* drivers, though ICH8 was mentioned in the description. My SATA controller identifies as "Intel Corporation Mobile SATA AHCI Controller" and seems to work with libata AHCI. I was wondering when support for this controller will be added through the ICH* driver, but is it possible that this SATA controller is supposed to be used with the standard AHCI driver? The chipset is an i965 (ICH8M). Peter John Fremlin wrote: > Tejun Heo has made an excellent patch for saving power with the AHCI > chipset. It saves about 1 W on my Thinkpad X60s. > > This patch will stop the ports when they are idle. To turn it on, > > echo 1 > /sys/module/libata/parameters/powersave > > This is very different from the patch I posted a while ago turning on > a few bits in the CMD register (ALPE and ASP) and which Intel is > apparently now trying. That only saves around 250mW. Tejun's patch > saves about 1 W. It should also make the ALPE and ASP stuff irrelevant > because it performs the same operation in software where better > information about usage is (theoretically) available. > > I have updated the patch for 2.6.22-rc4. That is the extent of my > involvement - if it works, thank Tejun Heo. But problems are quite > likely to have been introduced by my clumsy update, so if it doesn't > work, blame me first. > > > ------------------------------------------------------------------------ > > _______________________________________________ > Power mailing list > Power@bughost.org > http://www.bughost.org/mailman/listinfo/power >