From mboxrd@z Thu Jan 1 00:00:00 1970 From: Robert Hancock Subject: Re: Ubuntu patch enabling speedstep for sonoma processors Date: Thu, 24 Jun 2010 18:29:32 -0600 Message-ID: <4C23F86C.5090502@gmail.com> References: <4C237EAE.3000908@pardus.org.tr> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: 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 In-Reply-To: <4C237EAE.3000908@pardus.org.tr> Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: =?UTF-8?B?T3phbiDDh2HEn2xheWFu?= Cc: "linux-kernel@vger.kernel.org" , Ubuntu Kernel Team , Linux ACPI On 06/24/2010 09:50 AM, Ozan =C3=87a=C4=9Flayan wrote: > Hi, > > The following patch enables speedstep for sonoma processors: > http://kernel.ubuntu.com/git?p=3Dubuntu/ubuntu-maverick.git;a=3Dblobd= iff;f=3Darch/x86/kernel/cpu/cpufreq/speedstep-centrino.c;h=3Dee4e9f8050= 752923f9671f61ffbea662bc9ad12a;hp=3D9b1ff37de46ae6a729f48d2d94ad3054880= 6884d;hb=3D23120eb5ae5a12924565e8af3d946a015e1caaf9;hpb=3D215cc71ef0b26= b9434404f387681d9bd173d2434 > > 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 s= ome 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 ove= r- > 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 ti= me, did you see > any negative effect like the aforementioned risk of over/under-voltin= g the chip? The acpidump from that system would be a good start, to figure out why=20 acpi-cpufreq isn't working.. -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html