Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754250Ab0FYA3g (ORCPT ); Thu, 24 Jun 2010 20:29:36 -0400 Received: from mail-iw0-f174.google.com ([209.85.214.174]:37409 "EHLO mail-iw0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752380Ab0FYA3f (ORCPT ); Thu, 24 Jun 2010 20:29:35 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:content-type:content-transfer-encoding; b=d8Nd7l2wbL5fCSGFQS2/JZNJHrUT/IDtDok67z9g2/RWzpJtLYdEirSVEiHUYyTRAA B/TnXFiv2F1VnjSNSYPLEH8y0ZPL61Dk2qrZe1n4KqjWxlDre77GcYoaa1Op+lf99J9G ukj2Pt3as4ZQjim6x/L6RuNHxK/tRJv5fOgkg= Message-ID: <4C23F86C.5090502@gmail.com> Date: Thu, 24 Jun 2010 18:29:32 -0600 From: Robert Hancock User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.1.10) Gecko/20100621 Fedora/3.0.5-1.fc13 Thunderbird/3.0.5 MIME-Version: 1.0 To: =?UTF-8?B?T3phbiDDh2HEn2xheWFu?= CC: "linux-kernel@vger.kernel.org" , Ubuntu Kernel Team , Linux ACPI Subject: Re: Ubuntu patch enabling speedstep for sonoma processors References: <4C237EAE.3000908@pardus.org.tr> In-Reply-To: <4C237EAE.3000908@pardus.org.tr> 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: 2012 Lines: 46 On 06/24/2010 09:50 AM, Ozan Çağlayan wrote: > Hi, > > The following patch enables speedstep for sonoma processors: > http://kernel.ubuntu.com/git?p=ubuntu/ubuntu-maverick.git;a=blobdiff;f=arch/x86/kernel/cpu/cpufreq/speedstep-centrino.c;h=ee4e9f8050752923f9671f61ffbea662bc9ad12a;hp=9b1ff37de46ae6a729f48d2d94ad30548806884d;hb=23120eb5ae5a12924565e8af3d946a015e1caaf9;hpb=215cc71ef0b26b9434404f387681d9bd173d2434 > > The patch never got accepted by upstream after some discussions: > > http://linux.derkeiler.com/Mailing-Lists/Kernel/2008-06/msg01078.html > > """ > This patch has been floating around for years. > So long, I've forgotten the original reason it wasn't accepted. > It had something to do with it working for some users, but not others, > and we can't detect the 'not working' case. > > speedstep-centrino is also deprecated in favour of acpi-cpufreq for some time. > If acpi isn't working on these machines, we should find out why. > > Dave Jones > """ > > """ > My recollection is that we had no way to work out which voltage table > was appropriate for a given CPU, so there was a risk of us either over- > or under-volting the chip. Doing it via ACPI is safe. > > Matthew Garrett > """ > > I have bug report from a user which complains that frequency scaling is not available > on its computer. This patch fixes the issue but seen the discussions there should be a > better and more correct way to fix the issue. > > What should I do in order to debug and try to fix it? > > And also seen that Ubuntu carries this patch for a relatively long time, did you see > any negative effect like the aforementioned risk of over/under-volting the chip? The acpidump from that system would be a good start, to figure out why acpi-cpufreq isn't working.. -- 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/