From mboxrd@z Thu Jan 1 00:00:00 1970 From: Dirk Brandewie Subject: Re: power management regression in linux 3.10? Date: Mon, 03 Jun 2013 12:37:21 -0700 Message-ID: <51ACF071.702@gmail.com> References: <1370282175.18020.4.camel@localhost> <1426816.yLxoxJJ6NX@vostro.rjw.lan> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from mail-pb0-f43.google.com ([209.85.160.43]:43789 "EHLO mail-pb0-f43.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756029Ab3FCThY (ORCPT ); Mon, 3 Jun 2013 15:37:24 -0400 Received: by mail-pb0-f43.google.com with SMTP id ma3so6160077pbc.2 for ; Mon, 03 Jun 2013 12:37:24 -0700 (PDT) In-Reply-To: <1426816.yLxoxJJ6NX@vostro.rjw.lan> Sender: linux-pm-owner@vger.kernel.org List-Id: linux-pm@vger.kernel.org To: "Rafael J. Wysocki" Cc: Michael Karcher , linux-pm@vger.kernel.org, Len Brown , dirk.brandewie@gmail.com On 06/03/2013 12:34 PM, Rafael J. Wysocki wrote: > On Monday, June 03, 2013 07:56:15 PM Michael Karcher wrote: >> Hello, >> >> I am using an IBM ThinkPad T60 (i915, Core 2 Duo T7200) and recently >> upgraded from a custom 3.7 kernel to a custom 3.10-rc4 kernel >> (v3.10-rc4-1-gc026d8e). >> After upgrading, I get around 17-20W power usage instead of 12-15W power >> usage as I had with 3.7. powertop show that CPU0 is in state POLL all of >> the idle time, while CPU1 correctly enters C3. >> >> As this may be caused by my kernel configuration, I pastebinned >> my .config to http://pastebin.ca/2388457. Note that I am using >> CONFIG_NO_HZ_FULL, which might be nonstandard and actually not sensible >> for a standard single-user laptop system with GUI. >> >> Do you want me to try something to debug the problem? > > Yes, please try with CONFIG_NO_HZ_IDLE and see if you can reproduce the > problem. > > Does your system use intel_idle? You've set that in .config, but can you check > what dmesg says, please? > > Rafael > > Unset CONFIG_NO_HZ it is setting CONFIG_CPU_IDLE_GOV_MENU which with CONFIG_NO_HZ_FULL set is confusing intel_pstate. I am still trying to figure out what the root cause is commit 5811d996 seems to be implicated. --Dirk