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From: Darren Hart <dvhart@linux.intel.com>
To: lm-sensors@vger.kernel.org
Subject: Re: [lm-sensors] w83795 fan control not working
Date: Fri, 15 Apr 2011 14:11:31 +0000	[thread overview]
Message-ID: <4DA85213.4030504@linux.intel.com> (raw)
In-Reply-To: <20110407150007.51dd1c06@endymion.delvare>



On 04/15/2011 12:59 AM, Jean Delvare wrote:
> On Thu, 14 Apr 2011 22:30:53 -0700, Darren Hart wrote:
>> After trying a different kernel, I was able to get reading from the
>> w83795 again. I applied the fan to the chipset until it reached it's
>> lowest point (52.5C while idle). I then positioned the fan away from the
>> chipset and watched the temperature rise until it reached 84.5C and the
>> fans sped up to > 4000RPM.
>>
>> FAN 1            | 2401.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 2            | 0.000      | RPM        | nr    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 3            | 2401.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 4            | 4356.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 5            | 3969.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>>
>>
>> Given that the system is idle, and Super Mictro stated the chipset
>> should not exceed 75C, and I have no obstructions in the case and no
>> expansion boards to add heat, something appears to be wrong.
>>
>> Here is an annotated log of the experiment, one reading every 10 seconds:
>>
>> dvhart@rage:~$ while true; do sensors w83795g-i2c-0-2f | grep temp1;
>> sleep 10; done
>> temp1:       +61.2°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +59.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +57.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +56.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +55.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +54.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +53.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +52.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +52.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +53.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +55.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +56.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +58.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +60.2°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +61.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +63.2°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +64.2°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +65.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +66.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +67.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +68.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +69.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +70.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +71.2°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +72.2°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +72.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +73.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +74.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +75.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +75.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +76.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +77.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +77.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +77.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +78.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +78.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +79.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +79.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +79.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +80.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +80.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +80.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +81.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +81.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +81.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +81.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +82.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +82.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +82.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +82.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +82.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +83.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +84.5°C  (high = +127.0°C, hyst = +127.0°C)
>>
>> Fan speed jumped up at this point:
>>
>> FAN 1            | 2401.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 2            | 0.000      | RPM        | nr    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 3            | 2401.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 4            | 4356.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>> FAN 5            | 3969.000   | RPM        | ok    | 400.000   | 576.000
>>   | 784.000   | 33856.000 | 34225.000 | 34596.000
>>
>> And stayed at high speed until:
>>
>> temp1:       +79.2°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +79.8°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +79.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +79.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +80.0°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +80.5°C  (high = +127.0°C, hyst = +127.0°C)
>> temp1:       +81.0°C  (high = +127.0°C, hyst = +127.0°C)
>>
>> And sped up again here.
>> And so on.
> 
> The W83795ADG can be programmed to switch fans to full speed when
> certain temperature limits are exceeded. The driver doesn't currently
> expose these settings, but my guess is that's what you're seeing.
> According to the datasheet, the default value for temperature limit
> registers for this mechanism is 0x50, that is... 80°C.

Which is consistent with Super Micro saying the chipset must remain
below 75C. A fan brings it down 30C. I'm looking into adding a fan or
replacing the heat sink, or both. With that, I'll be giving up on
fancontrol for this machine - since it behaves itself just fine when the
chipset isn't overheating.

-- 
Darren Hart
Intel Open Source Technology Center
Yocto Project - Linux Kernel

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      parent reply	other threads:[~2011-04-15 14:11 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-04-07 13:00 [lm-sensors] w83795 fan control not working Jean Delvare
2011-04-07 20:59 ` Darren Hart
2011-04-08 12:46 ` Jean Delvare
2011-04-09  0:11 ` Darren Hart
2011-04-12 12:16 ` Jean Delvare
2011-04-15  5:04 ` Darren Hart
2011-04-15  5:30 ` Darren Hart
2011-04-15  7:59 ` Jean Delvare
2011-04-15 14:11 ` Darren Hart [this message]

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