Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755439AbXHBJ6c (ORCPT ); Thu, 2 Aug 2007 05:58:32 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753384AbXHBJ6Z (ORCPT ); Thu, 2 Aug 2007 05:58:25 -0400 Received: from mail.suse.de ([195.135.220.2]:50221 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753387AbXHBJ6Y (ORCPT ); Thu, 2 Aug 2007 05:58:24 -0400 Subject: Re: 2.6.22 regression: thermal trip points From: Thomas Renninger Reply-To: trenn@suse.de To: Adrian =?ISO-8859-1?Q?Schr=F6ter?= Cc: Knut Petersen , linux-kernel@vger.kernel.org, Andrew Morton , pavel@ucw.cz, mjg59@srcf.ucam.org, lenb@kernel.org, "Zhang, Rui" , Jean Delvare , Alexey Starikovskiy In-Reply-To: <200708021145.09377.adrian@suse.de> References: <46B1988C.3090302@t-online.de> <1186047747.18821.450.camel@queen.suse.de> <200708021145.09377.adrian@suse.de> Content-Type: text/plain; charset=utf-8 Organization: Novell/SUSE Date: Thu, 02 Aug 2007 11:58:21 +0200 Message-Id: <1186048701.18821.459.camel@queen.suse.de> Mime-Version: 1.0 X-Mailer: Evolution 2.8.2 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1791 Lines: 40 On Thu, 2007-08-02 at 11:45 +0200, Adrian Schröter wrote: > On Thursday 02 August 2007 11:42:27 wrote Thomas Renninger: > > On Thu, 2007-08-02 at 10:40 +0200, Knut Petersen wrote: > > > Hi everybody! > > > > > > Kernel 2.6.22 decreases performance by about 50% on my system. > > > No, I do not like that. The reason is a broken BIOS, granted, but there > > > was a perfect workaround in the kernel that has been dropped. > > > > > > mainboard: AOpen i915GMm-hfs, AWARD BIOS > > > cpu: Pentium-M 750 (0.8 to 1.86 MHz) > > > openSuSE 10.2 with kernel 2.6.22.1 > > > > Is this a DELL laptop that gets throttled by 75% to throttling state 6 > > if 60 degrees are exceeded? > > Adrian has such a machine..., no idea what is going on with that one, > > but only workaround to get any use out of this machine is to override at > > least the passive trip point. > > JFYI, there are plenty of these systems around, it was one out of four > standard Novell modells. I am mabye just the first one who uses Factory on > it, but expect more bugreports when 10.3 gets released ... Oops. So this is not broken HW/BIOS, but definitely a kernel problem? Only idea that comes to my mind finding this is to grep through the DSDT and look out for code that accesses CPU throttling HW ports. Maybe ACPI subsystem gets something wrong, processing this code and activating throttling by accident? Anyway, only solution/workaround to use these machines with current kernels is to override trip points, maybe the patch should really just be reverted... Thomas - 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/