From mboxrd@z Thu Jan  1 00:00:00 1970
From: Charles <c@catcons.co.uk>
Date: Mon, 05 Dec 2011 12:16:15 +0000
Subject: [lm-sensors] 3 wire fan on 4 pin header (was pwmconfig/fancontrol
Message-Id: <4EDCB33F.2090105@catcons.co.uk>
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To: lm-sensors@vger.kernel.org

On 04/12/11 16:30, lm-sensors-request@lm-sensors.org wrote:
> Date: Sun, 4 Dec 2011 11:03:45 +0100
> From: Jean Delvare <khali@linux-fr.org>
> 
> Hi Charles,
[snip]
> On 4-pin headers, the PWM signal is separated from the power. So you
> can't control a 3-wire fan plugged in a 4-pin header (the PWM signal is
> on the unconnected pin [1].)
> 
> -- Jean Delvare

Hello Jean :)

I already replied to this but just realised I am controlling a 3-wire
S-Flex SFF21E fan
(http://www.scythe-usa.com/product/acc/002/sflex_detail.html) on a
4-wire port on an ASUS P8H76-V motherboard (works on both CHA_FAN and
CHA_FAN2).

If the 4-pin fan header is regarded as a 3-pin header with an extra pin
then the unconnected pin is the extra pin.

Perhaps ASUS have used an unconventional pinout ... ?

Best

Charles

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