Re: [lm-sensors] 3.10: NCT6776F sensor question with Supermicro X9SRL-F motherboard

From: "Justin Piszcz" <jpiszcz@lucidpixels.com>
To: lm-sensors@vger.kernel.org
Subject: Re: [lm-sensors] 3.10: NCT6776F sensor question with Supermicro X9SRL-F motherboard
Date: Wed, 03 Jul 2013 20:59:37 +0000	[thread overview]
Message-ID: <00ad01ce7830$3b135890$b13a09b0$@lucidpixels.com> (raw)
In-Reply-To: <002901ce77e9$dfac4f20$9f04ed60$@lucidpixels.com>

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-----Original Message-----
From: Guenter Roeck [mailto:linux@roeck-us.net] 
Sent: Wednesday, July 03, 2013 4:57 PM
To: Justin Piszcz
Cc: linux-kernel@vger.kernel.org; lm-sensors@lm-sensors.org
Subject: Re: [lm-sensors] 3.10: NCT6776F sensor question with Supermicro
X9SRL-F motherboard

[ .. ]

> 09: 0a 00 00 00 00 0a 0a 0a 0a aa ef 80 ff 40 46 c4 

> 0a: 0e 01 00 00 ff 00 00 ff 00 00 80 66 66 06 01 01 

                                                ^^

This shows that PECI Agent 0 is supposed to be enabled.

> Bank 2:

>     00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 

> 00: 8c 32 00 01 01 33 01 3c ff 33 ff ff 00 ff ff ff 

      ^^

This value suggests that the second temperature sensor (the one creating

the alarm) is supposed to be the PECI source (which reports the CPU
temperature

to the NCT6776), and that it is supposed to be used to control the speed

of the CPU fan.

            ^^

Fan control is in manual mode. Did you set this ?

It is quite unusual.

Setting:                

Current FAN Mode is Optimal.

Set Fan to Standard Speed

Set Fan to Full Speed

Set Fan to Optimal Speed

> Bank 7:

>     00 01 02 03 04 05 06 07 08 09 0a 0b 0c 0d 0e 0f 

> 00: ff 95 02 10 00 00 00 00 00 64 00 00 00 00 00 00 

> 01: 00 00 00 00 00 00 00 f8 80 f8 80 f8 80 f8 80 00 

                                                   ^^

00 here shows that the PECI source is not active, ie the CPU does not
deliver

PECI data to the NCT6776. This explains the alarm.

Practical impact is probably limited as fan control is configured to be
manual

anyway, but I wonder why PECI doesn't work on your board. PECI configuration

is identical to my Supermicro board.

Guenter

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