Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S965260AbWEaXbL (ORCPT ); Wed, 31 May 2006 19:31:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S965261AbWEaXbL (ORCPT ); Wed, 31 May 2006 19:31:11 -0400 Received: from bobcat.it.wsu.edu ([134.121.0.132]:52703 "EHLO bobcat.it.wsu.edu") by vger.kernel.org with ESMTP id S965260AbWEaXbJ (ORCPT ); Wed, 31 May 2006 19:31:09 -0400 Message-ID: <447E2726.8020507@sandall.us> Date: Wed, 31 May 2006 16:30:46 -0700 From: Eric Sandall Organization: Source Mage GNU/Linux User-Agent: Mail/News 1.5.0.2 (X11/20060427) MIME-Version: 1.0 To: Robert Hancock CC: Dave Jones , linux-kernel@vger.kernel.org, Mattia Dongili Subject: Re: cpufreq and kernel >2.6.15.6 is limited References: <6imLa-3G2-11@gated-at.bofh.it> <6in4s-44o-13@gated-at.bofh.it> <447D12D3.9050306@shaw.ca> In-Reply-To: <447D12D3.9050306@shaw.ca> X-Enigmail-Version: 0.93.2.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1936 Lines: 50 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Robert Hancock wrote: > Dave Jones wrote: >> On Tue, May 30, 2006 at 05:25:26PM -0700, Eric Sandall wrote: >> > > It seems that any kernel on my Dell Inspiron 5100 after 2.6.15.6 >> > (including 2.6.17-rc5) 'breaks' my cpufreq in that up to and including >> > 2.6.15.6 I can scale between 300MHz-2.4GHz, but after (starting with >> > 2.6.16) I can only scale between 2.1GHz and 2.4GHz. >> > > I've attached the files, sorted by kernel, I assume may be >> helpful. Let >> > me know if you need any more. >> >> It may have worked in the past, but the CPU has an errata which makes >> it an unsafe operation to scale below 2GHz. > > There was some discussion about whether this was correct or not in this > thread: > > http://groups.google.ca/group/fa.linux.kernel/browse_thread/thread/d5b5905d7f1aa221/66c41ee3a26583b3 > > > Did this ever get resolved? From my reading of the N60 erratum, > disabling the 12.5% duty cycle sounds like this should be enough, > disabling everything under 2GHz is not necessary.. I would definitely prefer that approach of removing the problem frequency rather than all 8. - -sandalle - -- Eric Sandall | Source Mage GNU/Linux Developer eric@sandall.us | http://www.sourcemage.org/ http://eric.sandall.us/ | SysAdmin @ Shock Physics @ WSU http://counter.li.org/ #196285 | http://www.shock.wsu.edu/ -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.3 (GNU/Linux) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org iD8DBQFEficmHXt9dKjv3WERAhMqAJ9u9AMHd+X/eQ5FxgrHF7BF+Gd+FgCfY9JR PFtmAt7+9z+CO6KnZw3sxeI= =3qP/ -----END PGP SIGNATURE----- - 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/