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=-0.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS 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 2778DC34050 for ; Wed, 19 Feb 2020 14:23:01 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id EA96B24656 for ; Wed, 19 Feb 2020 14:23:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727786AbgBSOW4 convert rfc822-to-8bit (ORCPT ); Wed, 19 Feb 2020 09:22:56 -0500 Received: from youngberry.canonical.com ([91.189.89.112]:32999 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727855AbgBSOW4 (ORCPT ); Wed, 19 Feb 2020 09:22:56 -0500 Received: from mail-pl1-f200.google.com ([209.85.214.200]) by youngberry.canonical.com with esmtps (TLS1.2:ECDHE_RSA_AES_128_GCM_SHA256:128) (Exim 4.86_2) (envelope-from ) id 1j4QFZ-000220-MG for linux-ide@vger.kernel.org; Wed, 19 Feb 2020 14:22:53 +0000 Received: by mail-pl1-f200.google.com with SMTP id w17so251848plq.16 for ; Wed, 19 Feb 2020 06:22:53 -0800 (PST) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:content-transfer-encoding:mime-version :subject:message-id:date:cc:to; bh=MLzunwtdiwZE8X3dSBg1bcU+Imt/wqtftJaxuJ1ldhU=; b=EmNyziiMCjFtT2QynVz3FvIsnAVvlEjGn2kxy3mUceiaAlGi20WlTiAy0orXur2A1V Ec/z/an0Zwo097LrM/VZMfN7znJ7EJbCb2e98LkWGwCGRlmQCxnhhd0bLaeBFrztyrhr dydy+aKtfIvZS5zxi3dwes2QNqurLK7ljMBsN4SFXgbvNsm5doYSXDTpWPg+pSMOysrV /jY4XozsXs8TyX1Cw4exfkx2aIZGsLShjtDhLeuRTrH15+66ymXtGLcmUcZUzEVHZ0l7 d7NuwZ1zamzUA+v66DrYjfwP/8MYfrVnTvk45nTI5B/mnvJ+5MxOCXU5m+8VHXN+DrCy e4Uw== X-Gm-Message-State: APjAAAXb1ymLxTOcftDmU72Jbn28+ZT+S9oKWugkJFetjJz6CstvIfmx A7xHyDpri83HxdND87sxL8KUWdaH0VyYjTIh47wnwf/eHjVpzcXFnLkDI0m3FGMsNp/cUjO2MaR SCApVpKSf7rpG9zfhjlBIzqG+TxlLhcVE6h2sOg== X-Received: by 2002:a63:f84b:: with SMTP id v11mr27755929pgj.133.1582122172397; Wed, 19 Feb 2020 06:22:52 -0800 (PST) X-Google-Smtp-Source: APXvYqyAf9zQyTPVPbMjR6FbxyzaCj2ekLS3doKIrUEPzVc140+FEtyEVjAoXaVkdyd8BTxOWOpurg== X-Received: by 2002:a63:f84b:: with SMTP id v11mr27755913pgj.133.1582122172066; Wed, 19 Feb 2020 06:22:52 -0800 (PST) Received: from 2001-b011-380f-3214-7181-50ee-02bc-c2ee.dynamic-ip6.hinet.net (2001-b011-380f-3214-7181-50ee-02bc-c2ee.dynamic-ip6.hinet.net. [2001:b011:380f:3214:7181:50ee:2bc:c2ee]) by smtp.gmail.com with ESMTPSA id w26sm3190144pfj.119.2020.02.19.06.22.50 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 19 Feb 2020 06:22:51 -0800 (PST) From: Kai-Heng Feng Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 8BIT Mime-Version: 1.0 (Mac OS X Mail 13.0 \(3608.60.0.2.5\)) Subject: Hard Disk consumes lots of power in s2idle Message-Id: <0955D72C-D24D-402E-884F-C706578BF477@canonical.com> Date: Wed, 19 Feb 2020 22:22:48 +0800 Cc: Linux PM , linux-ide@vger.kernel.org, open list , Kent Lin To: Srinivas Pandruvada X-Mailer: Apple Mail (2.3608.60.0.2.5) Sender: linux-ide-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-ide@vger.kernel.org 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? Kai-Heng