From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752265AbaBZCtF (ORCPT ); Tue, 25 Feb 2014 21:49:05 -0500 Received: from mail-pd0-f181.google.com ([209.85.192.181]:38193 "EHLO mail-pd0-f181.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751075AbaBZCtD (ORCPT ); Tue, 25 Feb 2014 21:49:03 -0500 Message-ID: <530D561A.4030509@mit.edu> Date: Tue, 25 Feb 2014 18:48:58 -0800 From: Andy Lutomirski User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.3.0 MIME-Version: 1.0 To: Dieter Mummenschanz , linux-kernel@vger.kernel.org Subject: Re: intel_pstate: Haswell i7-4600M refuses to enter lower Package States References: In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 02/20/2014 04:29 AM, Dieter Mummenschanz wrote: > Hello, > > on my Lenovo T440p Laptop the Haswell i7-4600M CPU refuses to enter lower PC states resulting in 14-15 Watts continuous power drain even if the system is idle and every tunalbes in powertop 2.5 are enabled. The issue is reproducable with Kernel versions 3.13 up to 3.14-rc3. > > Did anyone else experience a similar issue? Something's confused here. Do you mean P-states (i.e. performance states or "frequency" settings) or PC-states (i.e. "package C-states")? I suspect that you mean the latter, in which case intel_pstate has nothing to do with the problem. The relevant diagnostic is the output from turbostat. --Andy