From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964812AbaEQPZt (ORCPT ); Sat, 17 May 2014 11:25:49 -0400 Received: from mail.active-venture.com ([67.228.131.205]:62988 "EHLO mail.active-venture.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757116AbaEQPZs (ORCPT ); Sat, 17 May 2014 11:25:48 -0400 X-Originating-IP: 108.223.40.66 Message-ID: <53777F72.3000907@roeck-us.net> Date: Sat, 17 May 2014 08:25:38 -0700 From: Guenter Roeck User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.4.0 MIME-Version: 1.0 To: Jean Delvare , =?ISO-8859-1?Q?Pali_Roh=E1r?= CC: linux-kernel@vger.kernel.org Subject: Re: Dell Latitude E6440 & i8k References: <201405162037.41782@pali> <20140516211117.0c766287@endymion.delvare> In-Reply-To: <20140516211117.0c766287@endymion.delvare> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 05/16/2014 12:11 PM, Jean Delvare wrote: > Hi Pali, > > On Fri, 16 May 2014 20:37:41 +0200, Pali Rohár wrote: >> Hello, >> >> on Dell Latitude E6440 driver i8k reporting total nonsense values > > That's kind of excessive wording, the output isn't that bad. > >> $ sensors >> i8k-virtual-0 >> Adapter: Virtual device >> Right Fan: 93450 RPM >> CPU: +57.0°C >> temp2: +57.0°C >> temp3: +40.0°C >> temp4: +127.0°C >> >> Right Fan and temp4 are for sure incorrect. > > Driver is reverse-engineered so this is best effort and some tweaking > may be needed. > >> Value temp4 is always 127 and is never changing, but value for >> Right Fan is increasing when fan is more noisy. So it looks like >> value for Right Fan is not correctly normalized or multiplier is >> incorrect. >> >> And name "Right" is incorrect too. Fan is on left side of this >> notebook, not right as reported by driver. >> >> It is possible to fix these problems? > > Load the i8k driver with fan_mult=1. > Would it make sense to change the default multiplier to 1 ? Lots of people have problems with it, and trying to figure out affected machines one by one would be an all but impossible task. Guenter