Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933141Ab0FBUK0 (ORCPT ); Wed, 2 Jun 2010 16:10:26 -0400 Received: from mail-fx0-f46.google.com ([209.85.161.46]:41388 "EHLO mail-fx0-f46.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758531Ab0FBUKW (ORCPT ); Wed, 2 Jun 2010 16:10:22 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=subject:from:to:cc:in-reply-to:references:content-type:date :message-id:mime-version:x-mailer:content-transfer-encoding; b=gmq0lzRt3dl/Fh3HnJ1vben/+NM7aNSdOPfCZSQLi6uD1fwAFe2bbX7TC7hcJzwz/4 fR30J1tXAhKCHHY+/iclamPr/56DD4MbnAQh5XnOQolxMt6cBTiHlrlu6l/CM+I4RoDW 6VsjThNbNS+SAyKZZCXDjDs295UV+bi/vYqfQ= Subject: Re: [PATCH 2/2] hwmon: (coretemp) Get TjMax value from MSR From: Maxim Levitsky To: Huaxu Wan Cc: linux-kernel@vger.kernel.org, lm-sensors@lm-sensors.org, huaxu.wan@intel.com, khali@linux-fr.org In-Reply-To: <1275496456.32562.4.camel@maxim-laptop> References: <20100507095945.GB12190@owl> <1275111551.3427.4.camel@maxim-laptop> <20100531013950.GA8265@owl> <1275496456.32562.4.camel@maxim-laptop> Content-Type: text/plain; charset="UTF-8" Date: Wed, 02 Jun 2010 23:10:16 +0300 Message-ID: <1275509416.6277.2.camel@maxim-laptop> Mime-Version: 1.0 X-Mailer: Evolution 2.28.3 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1806 Lines: 48 On Wed, 2010-06-02 at 19:34 +0300, Maxim Levitsky wrote: > On Mon, 2010-05-31 at 09:39 +0800, Huaxu Wan wrote: > > On 08:39 Sat 29 May, Maxim Levitsky wrote: > > > On Fri, 2010-05-07 at 17:59 +0800, Huaxu Wan wrote: > > > > The MSR IA32_TEMPERATURE_TARGET contains the TjMax value in the newer > > > > processers. > > > > > > I know that TjMax on my system is 85, and now coretemp reports wrong > > > temperatures. > > > First of all BIOS using stupid tricks actualy reports CPU temperature > > > through ACPI, and assuming it was correct TjMax is 85. > > > It also shuts down the system if I 'lie' to it that cpu temperature is > > > 85C. > > > > From the list at [1], the TjMax(Tjunction) of T5450 is 100C. Does anyone > > here can make a double check? > > > > [1] http://ark.intel.com/Product.aspx?id=30787&processor=T5450&spec-codes=SLA4F > > This is very interesting. > > With TjMax 85C, the CPUs idle temperature is reported at around 45~50C > GPU temperature that is around 60C > > BIOS also reports 45~50C. > > BIOS hooks an SMI to CPU thermal report, and stores the temperature it > read in ram, then ACPI code reads it, reports and passes to the EC > (embedded controller). > > If I write myself 85 to embedded controller, systems shuts down. > (values less that 85, eg 84 don't shut system). Another clue is that right after resume from ram, after long delay (~hour) the displayed temperature with TjMax 85 is 33C. Since room temperature here is around 27C, this seems more plausible that 33 + 15 = 48C Best regards, Maxim Levitsky -- 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/