[lm-sensors] 3 wire fan on 4 pin header (was pwmconfig/fancontrol error (version 3.3.1))

[Charles]

On 04/12/11 16:30, lm-sensors-request at lm-sensors.org wrote:
> Date: Sun, 4 Dec 2011 11:03:45 +0100
> From: Jean Delvare <khali at 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