From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AD7F5C3405F for ; Wed, 19 Feb 2020 18:36:07 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 92F9E2467B for ; Wed, 19 Feb 2020 18:36:07 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726645AbgBSSgG (ORCPT ); Wed, 19 Feb 2020 13:36:06 -0500 Received: from mga17.intel.com ([192.55.52.151]:27984 "EHLO mga17.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726598AbgBSSgG (ORCPT ); Wed, 19 Feb 2020 13:36:06 -0500 X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga001.fm.intel.com ([10.253.24.23]) by fmsmga107.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Feb 2020 10:36:06 -0800 X-IronPort-AV: E=Sophos;i="5.70,461,1574150400"; d="scan'208";a="348991894" Received: from ramya1g-mobl.gar.corp.intel.com ([10.252.147.199]) by fmsmga001-auth.fm.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 19 Feb 2020 10:36:03 -0800 Message-ID: Subject: Re: Hard Disk consumes lots of power in s2idle From: Srinivas Pandruvada To: Kai-Heng Feng Cc: Linux PM , linux-ide@vger.kernel.org, open list , Kent Lin Date: Wed, 19 Feb 2020 10:36:00 -0800 In-Reply-To: <0955D72C-D24D-402E-884F-C706578BF477@canonical.com> References: <0955D72C-D24D-402E-884F-C706578BF477@canonical.com> Content-Type: text/plain; charset="UTF-8" User-Agent: Evolution 3.34.1-2 MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-ide-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org Hi Kai, On Wed, 2020-02-19 at 22:22 +0800, Kai-Heng Feng wrote: > Hi Srinivas, > > Your previous work to support DEVSLP works well on SATA SSDs, so I am > asking you the issue I am facing: > Once a laptop has a HDD installed, the power consumption during > S2Idle increases ~0.4W, which is quite a lot. > However, HDDs don't seem to support DEVSLP, so I wonder if you know > to do proper power management for HDDs? What is the default here cat /sys/power/mem_sleep s2idle or deep? Please follow debug steps here: https://01.org/blogs/qwang59/2018/how-achieve-s0ix-states-linux We need to check whether you get any PC10 residency or not. Thanks, Srinivas > > Kai-Heng