From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752567AbaCJHSX (ORCPT ); Mon, 10 Mar 2014 03:18:23 -0400 Received: from ns.horizon.com ([71.41.210.147]:26522 "HELO ns.horizon.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752393AbaCJHSV (ORCPT ); Mon, 10 Mar 2014 03:18:21 -0400 X-Greylist: delayed 400 seconds by postgrey-1.27 at vger.kernel.org; Mon, 10 Mar 2014 03:18:21 EDT Date: 10 Mar 2014 03:11:40 -0400 Message-ID: <20140310071140.19969.qmail@ns.horizon.com> From: "George Spelvin" To: jdelvare@suse.com Subject: Re: [lm-sensors] Tachometer speed returned rather than absolute fan speed? Cc: linux@horizon.com, linux-kernel@vger.kernel.org, lm-sensors@lm-sensors.org, lpapp@kde.org In-Reply-To: <20140307162524.6abd34be@endymion.delvare> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org > What did you think "tachometer speed" was, if not the fan speed? Does > the max6650 driver not return correct fan speeds for you? Given that most PC fans produce two pulses per rotation, I assumed it was the frequency of the tachometer signal, which is twice the fan RPM.