From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?Sune_M=F8lgaard?= Subject: Re: speedstep-centrino: ENODEV Date: Thu, 19 Oct 2006 22:30:53 +0200 Message-ID: <4537E07D.5080402@molgaard.org> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from cicero1.cybercity.dk ([212.242.40.4]:24054 "EHLO cicero1.cybercity.dk") by vger.kernel.org with ESMTP id S1946467AbWJSUbN (ORCPT ); Thu, 19 Oct 2006 16:31:13 -0400 In-Reply-To: Sender: linux-acpi-owner@vger.kernel.org List-Id: linux-acpi@vger.kernel.org To: "Pallipadi, Venkatesh" Cc: Jiri Slaby , Linux kernel mailing list , linux-acpi@vger.kernel.org Pallipadi, Venkatesh wrote: > > > OK. Things seem to be fine with the BIOS. That sounds promising :-) > You said it was working with 2.6.15. Do you remember whether kernel was using acpi-cpufreq or speedstep-centrino? Sorry, I don't know, but I can build it and check. > 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.... > Seems like 1 then. Will check the speedstep-centrino settings in the kernel. Thanks. I'll report back, but probably not until tomorrow. BR, Sune