Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1946371AbWJSS5H (ORCPT ); Thu, 19 Oct 2006 14:57:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1946367AbWJSS5H (ORCPT ); Thu, 19 Oct 2006 14:57:07 -0400 Received: from mga01.intel.com ([192.55.52.88]:41543 "EHLO mga01.intel.com") by vger.kernel.org with ESMTP id S1946356AbWJSS5E convert rfc822-to-8bit (ORCPT ); Thu, 19 Oct 2006 14:57:04 -0400 X-ExtLoop1: 1 X-IronPort-AV: i="4.09,330,1157353200"; d="scan'208"; a="149115615:sNHT20241172" X-MimeOLE: Produced By Microsoft Exchange V6.5 Content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 8BIT Subject: RE: speedstep-centrino: ENODEV Date: Thu, 19 Oct 2006 11:56:58 -0700 Message-ID: X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: speedstep-centrino: ENODEV Thread-Index: AcbzqyLKGSn02FDxRyixfBJ3yPIVNAAA+eTA From: "Pallipadi, Venkatesh" To: =?iso-8859-1?Q?Sune_M=F8lgaard?= Cc: "Jiri Slaby" , "Linux kernel mailing list" , X-OriginalArrivalTime: 19 Oct 2006 18:57:00.0381 (UTC) FILETIME=[5BA288D0:01C6F3B0] Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1985 Lines: 35 >-----Original Message----- >From: Sune M?lgaard [mailto:sune@molgaard.org] >Sent: Thursday, October 19, 2006 11:19 AM >To: Pallipadi, Venkatesh >Cc: Jiri Slaby; Linux kernel mailing list; linux-acpi@vger.kernel.org >Subject: Re: speedstep-centrino: ENODEV > >Thanks for taking an interest, if I haven't said so before. > >Now, I was about to write that I couldn't open /dev/mem, but luckily >remembered to try sudo'ing acpidump :-$ > >Enclosed is the dump, created while running 2.6.18.1. > OK. Things seem to be fine with the BIOS. You said it was working with 2.6.15. Do you remember whether kernel was using acpi-cpufreq or speedstep-centrino? One change that has happened in this region is that If your BIOS supports both speedstep-centrino and acpi-cpufreq, with 2.6.15 any one of those drivers would have worked. But now with 2.6.18, acpi-cpufreq will not work in the above case and you have to use speedstep_centrino. This was done because, speedstep-centrino has more features than acpi-cpufreq and also doing this helped to elimiate issues with lot of systems with kernel trying to do multiple ACPI PDC writes when BIOS doesn't expect it to. In short: (1) If you were using acpi-cpufreq in 2.6.15, there is a high chance that it wont work with 2.6.18 and you should be able to use speedstep-centrino in its place. Make sure you have properly configured speedstep-centrino (You should select X86_SPEEDSTEP_CENTRINO_ACPI along with X86_SPEEDSTEP_CENTRINO). (2) If you were using speedstep-centrino in 2.6.15 and now it doesn't work with 2.6.18, then we have a new regression here and we need to root cause it further by enabling cpufreq.debug and getting more debug messages to see where it is failing.... Thanks, Venki - 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/