From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751979AbdINKg1 (ORCPT ); Thu, 14 Sep 2017 06:36:27 -0400 Received: from mx1.redhat.com ([209.132.183.28]:45902 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751795AbdINKfi (ORCPT ); Thu, 14 Sep 2017 06:35:38 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 mx1.redhat.com 22C6AC047B70 Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; dmarc=none (p=none dis=none) header.from=redhat.com Authentication-Results: ext-mx07.extmail.prod.ext.phx2.redhat.com; spf=fail smtp.mailfrom=hdegoede@redhat.com From: Hans de Goede To: Tejun Heo Cc: Hans de Goede , Matthew Garrett , linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH 0/1] libata: Add new med_power_with_dipm link_power_management_policy setting Date: Thu, 14 Sep 2017 12:35:35 +0200 Message-Id: <20170914103536.7650-1-hdegoede@redhat.com> X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Thu, 14 Sep 2017 10:35:38 +0000 (UTC) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi All, As described by Matthew Garret quite a while back: https://mjg59.dreamwidth.org/34868.html On Intel CPUs starting with the Haswell generation SATA link power management can save a significant amount of power. Previous attempts to try and enable SATA LPM by default have gotten stuck on ome reports of some disks / SSDs not liking min_power leading to system crashes and in some cases even data corruption has been reported. This patch is another attempt to make the default Windows IRST driver settings Matthew found available under Linux, but instead of changing medium_power and potentially introducing regressions, this commit adds a new med_power_with_dipm setting. I've done a blog post asking people to test this new settings on laptops: https://hansdegoede.livejournal.com/18412.html As mentioned there my goal is to enable med_power_with_dipm as default LPM setting for laptops for Fedora 28 (to be released aprox. May 2018). How exactly this will be done is still up for debate, one option would be a kernel patch which recognizes the mobile variant of Intel's chipset and changes the default on those, another option is punting this to userspace. Regards, Hans