Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1763751Ab3ECVKu (ORCPT ); Fri, 3 May 2013 17:10:50 -0400 Received: from mail-da0-f54.google.com ([209.85.210.54]:65168 "EHLO mail-da0-f54.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1763484Ab3ECVKr (ORCPT ); Fri, 3 May 2013 17:10:47 -0400 Message-ID: <518427D4.3050104@gmail.com> Date: Fri, 03 May 2013 14:10:44 -0700 From: Dirk Brandewie User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130110 Thunderbird/17.0.2 MIME-Version: 1.0 To: "Rafael J. Wysocki" CC: =?UTF-8?B?VG9yYWxmIEbDtnJzdGVy?= , Dirk Brandewie , linux-acpi@vger.kernel.org, Linux Kernel , Linux PM list , Dirk Brandewie Subject: Re: 3.9.0 + CONFIG_X86_INTEL_PSTATE=y -> ThinkPad T420 with i5 lost ACPI functionality References: <5183EC09.9080208@gmx.de> <3715884.H8PIhhjRXL@vostro.rjw.lan> In-Reply-To: <3715884.H8PIhhjRXL@vostro.rjw.lan> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1915 Lines: 58 On 05/03/2013 12:36 PM, Rafael J. Wysocki wrote: > On Friday, May 03, 2013 06:55:37 PM Toralf Förster wrote: >> The following file doesn't exists at my Gentoo Linux >> /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load >> in 3.9.0 if I activate CONFIG_X86_INTEL_PSTATE=y >> >> That means, that a command like >> >> $> echo 1 > /sys/devices/system/cpu/cpufreq/ondemand/ignore_nice_load >> >> in /etc/rc.local is now no longer working. >> A high fan + high temperature are the result, even if just the BOINC client >> is run with low prio (nice 19) in the back ground. >> ignore_nice_load is a feature of the ondemand governor. The intel_pstate driver is seeing the load presented by the BOINC client and is adjusting the pstate accordingly. >> Manually loading the missing module won't work too : >> >> $> modprobe acpi_cpufreq >> modprobe: ERROR: could not insert 'acpi_cpufreq': Device or resource busy >> >> Is the behaviour a bug or a feature ? The intel_pstate drive has already registered as a scaling driver so when acpi_cpufreq tries to register as a scaling driver the registration fails > > The thermal management problem is not an intentional outcome, definitely. > >> In the later case: How can I achieve the previous behaviour back ? >> If you require the ondemand governor you can remove CONFIG_X86_INTEL_PSTATE from your configuration or add "intel_pstate=disable" to your kernel command line. --Dirk >> This issue might affect the RH EL kernel too [1] where I observed a similar behaviour. >> >> >> [1] http://elrepo.org/bugs/view.php?id=379 > > Dirk, is this the problem we were talking about recently or something else? > > Rafael > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/