From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1423853AbcBQQgw (ORCPT ); Wed, 17 Feb 2016 11:36:52 -0500 Received: from deferred-out-119.livemail.co.uk ([213.171.216.119]:51597 "EHLO deferred-out-119.livemail.co.uk" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1422903AbcBQQgv (ORCPT ); Wed, 17 Feb 2016 11:36:51 -0500 X-Greylist: delayed 1343 seconds by postgrey-1.27 at vger.kernel.org; Wed, 17 Feb 2016 11:36:51 EST From: VMHB To: linux-kernel@vger.kernel.org Subject: Memory power management Date: Wed, 17 Feb 2016 16:10:44 +0000 Message-ID: <2179037.fdTiYCS22n@linux-zu3i.site> Organization: Gnuit User-Agent: KMail/4.14.9 (Linux/3.16.7-29-desktop; KDE/4.14.9; x86_64; ; ) MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="us-ascii" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org While running kernel 3.16.7-29 on an AMD based machine the clock speed is being changed on the DDR3 modules. This is causing issues with our debugging tools which rely on the clock. As far as I know this should only be changed following a POWER DOWN or SELF REFRESH sequence. This only seems to happen when Linux is booted and not under the BIOS. I have searched in the kernel code and on the internet and although there is information and patches regarding power saving modes I cannot find any code in the kernel I am using. Can someone please give me any information on the source of this and preferably how it can be stopped? I am not subscribed to the list and would like to be copied personally with any responses.