[lm-sensors] IT8728 shows wrong CPU temperature

[lm-sensors] IT8728 shows wrong CPU temperature

[Tomas Johansson]

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Hi!

I have a Gigabyte GA-P67A-UD5-B3 with a IT8728F, yesterday i upgraded to Linux 3.3 and tested the new IT87 module.
As i will show below it shows wrong CPU temperature.

First:

temp1 shows system or motherboard if you want.
temp2 shows ?, probably unused
temp3 shows CPU but is 7-8 degrees wrong compared to BIOS (I know that temp3 is CPU because it is the only temp value that differ under load)


BIOS at this moment in time showed:
SYS 34°C
CPU 32°C


coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:  +36.0°C  (high = +80.0°C, crit = +98.0°C)
Core 0:         +36.0°C  (high = +80.0°C, crit = +98.0°C)
Core 1:         +35.0°C  (high = +80.0°C, crit = +98.0°C)
Core 2:         +33.0°C  (high = +80.0°C, crit = +98.0°C)
Core 3:         +35.0°C  (high = +80.0°C, crit = +98.0°C)

it8728-isa-0290
Adapter: ISA adapter
in0:          +1.08 V  (min =  +0.00 V, max =  +3.06 V)
in1:          +2.03 V  (min =  +0.00 V, max =  +3.06 V)
in2:          +2.96 V  (min =  +0.00 V, max =  +3.06 V)
in3:          +2.93 V  (min =  +0.00 V, max =  +3.06 V)
in4:          +0.24 V  (min =  +0.00 V, max =  +0.84 V)
in5:          +1.20 V  (min =  +0.00 V, max =  +3.06 V)
in6:          +1.55 V  (min =  +0.00 V, max =  +3.06 V)
3VSB:         +3.38 V  (min =  +0.00 V, max =  +6.12 V)
Vbat:         +3.26 V  
fan1:        1056 RPM  (min =    0 RPM)
fan2:           0 RPM  (min =    0 RPM)
fan3:           0 RPM  (min =    0 RPM)
fan4:           0 RPM  (min =    0 RPM)
fan5:        1374 RPM  (min =    0 RPM)
temp1:        +34.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp2:        +31.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
temp3:        +25.0°C  (low  = +127.0°C, high = +127.0°C)  sensor = thermistor
intrusion0:  ALARM



Conclusion:

fan1, shows correct value.
fan5, shows correct value.
temp1 (system), shows correct value.
temp3 (CPU), shows wrong value, in this case 25°C instead of 32°C.


I have studied the other IT8278 reports i have found and as far as i can tell that they suffer from the same wrong cpu readings, i do not understand why they have reported them as correct...


Thanks in advance.

/Tomas
 		 	   		  

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Jean Delvare]

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Guenter Roeck]

On Fri, Mar 23, 2012 at 04:00:35AM -0400, Tomas Johansson wrote:
> Hi!
> 
> I have a Gigabyte GA-P67A-UD5-B3 with a IT8728F, yesterday i upgraded to Linux
> 3.3 and tested the new IT87 module.
> As i will show below it shows wrong CPU temperature.
> 
> First:
> 
> temp1 shows system or motherboard if you want.
> temp2 shows ?, probably unused
> temp3 shows CPU but is 7-8 degrees wrong compared to BIOS (I know that temp3 is
> CPU because it is the only temp value that differ under load)
> 
> 
> BIOS at this moment in time showed:
> SYS 34 C
> CPU 32 C
> 
> 
> coretemp-isa-0000
> Adapter: ISA adapter
> Physical id 0:  +36.0 C  (high = +80.0 C, crit = +98.0 C)
> Core 0:         +36.0 C  (high = +80.0 C, crit = +98.0 C)
> Core 1:         +35.0 C  (high = +80.0 C, crit = +98.0 C)
> Core 2:         +33.0 C  (high = +80.0 C, crit = +98.0 C)
> Core 3:         +35.0 C  (high = +80.0 C, crit = +98.0 C)
> 
> it8728-isa-0290
> Adapter: ISA adapter
> in0:          +1.08 V  (min =  +0.00 V, max =  +3.06 V)
> in1:          +2.03 V  (min =  +0.00 V, max =  +3.06 V)
> in2:          +2.96 V  (min =  +0.00 V, max =  +3.06 V)
> in3:          +2.93 V  (min =  +0.00 V, max =  +3.06 V)
> in4:          +0.24 V  (min =  +0.00 V, max =  +0.84 V)
> in5:          +1.20 V  (min =  +0.00 V, max =  +3.06 V)
> in6:          +1.55 V  (min =  +0.00 V, max =  +3.06 V)
> 3VSB:         +3.38 V  (min =  +0.00 V, max =  +6.12 V)
> Vbat:         +3.26 V  
> fan1:        1056 RPM  (min =    0 RPM)
> fan2:           0 RPM  (min =    0 RPM)
> fan3:           0 RPM  (min =    0 RPM)
> fan4:           0 RPM  (min =    0 RPM)
> fan5:        1374 RPM  (min =    0 RPM)
> temp1:        +34.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> temp2:        +31.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> temp3:        +25.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> intrusion0:  ALARM
> 
> 
> 
> Conclusion:
> 
> fan1, shows correct value.
> fan5, shows correct value.
> temp1 (system), shows correct value.
> temp3 (CPU), shows wrong value, in this case 25 C instead of 32 C.
> 
I am a bit lost here. Why do you assume that temp2 (which would show roughly
the correct temperature) is unused, and that temp3 is the CPU temperature ?
Why not temp2=CPU and temp3=??? 

What happens if you run something challenging on the system ?

Guenter

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Tomas Johansson]

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Because, these are idle values:

BIOS:
SYS 34 C
CPU 32 C

lm-sensors:
temp1:        +34.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
temp2:        +31.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
temp3:        +25.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor


And when i for example compile firefox temp3 will rise to around 45-50 C, while temp2 stays at 31 C.




> Date: Fri, 23 Mar 2012 01:14:56 -0700
> From: guenter.roeck@ericsson.com
> To: tomasx@hotmail.com
> CC: lm-sensors@lm-sensors.org
> Subject: Re: [lm-sensors] IT8728 shows wrong CPU temperature
> 
> On Fri, Mar 23, 2012 at 04:00:35AM -0400, Tomas Johansson wrote:
> > Hi!
> > 
> > I have a Gigabyte GA-P67A-UD5-B3 with a IT8728F, yesterday i upgraded to Linux
> > 3.3 and tested the new IT87 module.
> > As i will show below it shows wrong CPU temperature.
> > 
> > First:
> > 
> > temp1 shows system or motherboard if you want.
> > temp2 shows ?, probably unused
> > temp3 shows CPU but is 7-8 degrees wrong compared to BIOS (I know that temp3 is
> > CPU because it is the only temp value that differ under load)
> > 
> > 
> > BIOS at this moment in time showed:
> > SYS 34 C
> > CPU 32 C
> > 
> > 
> > coretemp-isa-0000
> > Adapter: ISA adapter
> > Physical id 0:  +36.0 C  (high = +80.0 C, crit = +98.0 C)
> > Core 0:         +36.0 C  (high = +80.0 C, crit = +98.0 C)
> > Core 1:         +35.0 C  (high = +80.0 C, crit = +98.0 C)
> > Core 2:         +33.0 C  (high = +80.0 C, crit = +98.0 C)
> > Core 3:         +35.0 C  (high = +80.0 C, crit = +98.0 C)
> > 
> > it8728-isa-0290
> > Adapter: ISA adapter
> > in0:          +1.08 V  (min =  +0.00 V, max =  +3.06 V)
> > in1:          +2.03 V  (min =  +0.00 V, max =  +3.06 V)
> > in2:          +2.96 V  (min =  +0.00 V, max =  +3.06 V)
> > in3:          +2.93 V  (min =  +0.00 V, max =  +3.06 V)
> > in4:          +0.24 V  (min =  +0.00 V, max =  +0.84 V)
> > in5:          +1.20 V  (min =  +0.00 V, max =  +3.06 V)
> > in6:          +1.55 V  (min =  +0.00 V, max =  +3.06 V)
> > 3VSB:         +3.38 V  (min =  +0.00 V, max =  +6.12 V)
> > Vbat:         +3.26 V  
> > fan1:        1056 RPM  (min =    0 RPM)
> > fan2:           0 RPM  (min =    0 RPM)
> > fan3:           0 RPM  (min =    0 RPM)
> > fan4:           0 RPM  (min =    0 RPM)
> > fan5:        1374 RPM  (min =    0 RPM)
> > temp1:        +34.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> > temp2:        +31.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> > temp3:        +25.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> > intrusion0:  ALARM
> > 
> > 
> > 
> > Conclusion:
> > 
> > fan1, shows correct value.
> > fan5, shows correct value.
> > temp1 (system), shows correct value.
> > temp3 (CPU), shows wrong value, in this case 25 C instead of 32 C.
> > 
> I am a bit lost here. Why do you assume that temp2 (which would show roughly
> the correct temperature) is unused, and that temp3 is the CPU temperature ?
> Why not temp2=CPU and temp3=??? 
> 
> What happens if you run something challenging on the system ?
> 
> Guenter
 		 	   		  

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Jean Delvare]

Tomas, please don't top-post.

On Fri, 23 Mar 2012 10:00:09 +0100, Tomas Johansson wrote:
> Because, these are idle values:
> 
> BIOS:
> SYS 34 C
> CPU 32 C

Most likely the above are NOT idle values. The BIOS is not idle - at
least never as idle as Linux can be with CPU frequency and voltage
scaling and low C states.

> lm-sensors:
> temp1:        +34.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> temp2:        +31.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> temp3:        +25.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> 
> 
> And when i for example compile firefox temp3 will rise to around 45-50 C, while temp2 stays at 31 C.

This is correct reasoning though. temp3 is CPU temp. But you're
comparing Linux idle with BIOS not idle, no surprise the values don't
match.

-- 
Jean Delvare

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Tomas Johansson]

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> Date: Fri, 23 Mar 2012 10:05:42 +0100
> From: khali@linux-fr.org
> To: tomasx@hotmail.com
> CC: lm-sensors@lm-sensors.org
> Subject: Re: [lm-sensors] IT8728 shows wrong CPU temperature
> 
> Tomas, please don't top-post.
> 
> On Fri, 23 Mar 2012 10:00:09 +0100, Tomas Johansson wrote:
> > Because, these are idle values:
> > 
> > BIOS:
> > SYS 34 C
> > CPU 32 C
> 
> Most likely the above are NOT idle values. The BIOS is not idle - at
> least never as idle as Linux can be with CPU frequency and voltage
> scaling and low C states.
> 
> > lm-sensors:
> > temp1:        +34.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> > temp2:        +31.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> > temp3:        +25.0 C  (low  = +127.0 C, high = +127.0 C)  sensor = thermistor
> > 
> > 
> > And when i for example compile firefox temp3 will rise to around 45-50 C, while temp2 stays at 31 C.
> 
> This is correct reasoning though. temp3 is CPU temp. But you're
> comparing Linux idle with BIOS not idle, no surprise the values don't
> match.
> 
> -- 
> Jean Delvare

Calm down. :)
You seem a litte bit hostile Jean, i am sorry if i do not live up to your standards.

However, i do not agree with you, no, BIOS is not IDLE but it is not FULL LOAD either. I have never seen a so big difference between BIOS and Linux idle, usually they are 1-2 degrees.
 		 	   		  

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Tomas Johansson]

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> Date: Fri, 23 Mar 2012 10:05:42 +0100
> From: khali@linux-fr.org
> To: tomasx@hotmail.com
> CC: lm-sensors@lm-sensors.org
> Subject: Re: [lm-sensors] IT8728 shows wrong CPU temperature
> 
> Tomas, please don't top-post.
> 
> On Fri, 23 Mar 2012 10:00:09 +0100, Tomas Johansson wrote:
> > Because, these are idle values:
> > 
> > BIOS:
> > SYS 34 C
> > CPU 32 C
> 
> Most likely the above are NOT idle values. The BIOS is not idle - at
> least never as idle as Linux can be with CPU frequency and voltage
> scaling and low C states.

I have CPU freq scaling and voltage scaling turned of, both in BIOS and in the compiled kernel. Do not know what C states.
 		 	   		  

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Jean Delvare]

On Fri, 23 Mar 2012 10:59:20 +0100, Tomas Johansson wrote:
> > Date: Fri, 23 Mar 2012 10:05:42 +0100
> > From: khali@linux-fr.org
> > On Fri, 23 Mar 2012 10:00:09 +0100, Tomas Johansson wrote:
> > > Because, these are idle values:
> > > 
> > > BIOS:
> > > SYS 34 C
> > > CPU 32 C
> > 
> > Most likely the above are NOT idle values. The BIOS is not idle - at
> > least never as idle as Linux can be with CPU frequency and voltage
> > scaling and low C states.
> 
> I have CPU freq scaling and voltage scaling turned of, both in BIOS and in the compiled kernel. Do not know what C states.

Google does know about them, for example:
http://www.hardwaresecrets.com/article/611

You don't need to know about the implementation details though. The
bottom line is: when implemented properly, a CPU consumes way less
power and generates way less heat when idle than when used.

-- 
Jean Delvare

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Jean Delvare]

On Fri, 23 Mar 2012 13:41:18 +0100, Jean Delvare wrote:
> On Fri, 23 Mar 2012 10:59:20 +0100, Tomas Johansson wrote:
> > I have CPU freq scaling and voltage scaling turned of, both in BIOS and in the compiled kernel. Do not know what C states.
> 
> Google does know about them, for example:
> http://www.hardwaresecrets.com/article/611
> 
> You don't need to know about the implementation details though. The
> bottom line is: when implemented properly, a CPU consumes way less
> power and generates way less heat when idle than when used.

Oh, and I forgot to mention: if you want to see how C states are used
under Linux on your specific system, install and run the powertop
utility.

-- 
Jean Delvare

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Jean Delvare]

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Tomas Johansson]

[-- Attachment #1.1: Type: text/plain, Size: 2299 bytes --]


> I have seen this in the past, many, many times. I'm in this
> "business" (and I'm using quotes because it's mostly done on my spare
> time) for 8 years so I have some experience about it all.
> 
> Let's just take the machine I'm working on right now as an example.
> It's a Celeron 2.4 GHz on an Asus P4P800-VM board, using a Winbond
> W83627THF for monitoring. The BIOS displays a CPU temperature of
> 39.5°C. Linux displays a CPU temperature of 32.5°C. This is a 6°C
> difference, close to what you're seeing on your system.
> 
> This machine happens to be plugged on a powermeter, so I can see that
> it consumes 84 W in the BIOS, and only 62 W under Linux. So the
> temperature difference is easily explained. As a matter of fact, if I
> put some load on the CPU (md5sum -b /dev/zero) the temperature climbs
> to 40°C, so roughly the same as what the BIOS prints.
> 
> I am not claiming that there is no bug in our IT8728F support. Without
> a datasheet, odds are there are bugs. I am not even claiming that no
> adjustments must be made for "sensors" to report the right CPU
> temperature on your specific system. I am claiming that you did not
> provide factual data that would make me regard this possibility as
> likely.
> 
> If you want to make sure, then get your hands on a powermeter, or
> external thermometer, or ideally both. Then compare their measurements
> under the BIOS and under Linux. If these measurements are the same and
> the CPU temperature values reported by the BIOS and "sensors" differ
> significantly, then OK, I'll admit some more investigation, and possible
> a fix, are needed.
> 
> -- 
> Jean Delvare
> http://khali.linux-fr.org/wishlist.html

Now we are talking, thanks for the information. :)
I
 guess, my original intention with my letter wasn´t giving you more work
 but rather broadcasting that it might be a problem with the IT8728F 
support, i guess with 3.3 out we will soon see more usage of it. And 
maybe more people will report, or not...

With your experience what would you recommend.
1. Asssuming ~26 C is the real idle value
2. fiddle with the lm sensors config file and add a couple of degrees
3. Get a life and stop monitoring my fan speeds and temps

Thanks for your help

Tomas
 		 	   		  

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Jean Delvare]

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Re: [lm-sensors] IT8728 shows wrong CPU temperature

[Tomas Johansson]

[-- Attachment #1.1: Type: text/plain, Size: 1038 bytes --]




> Date: Fri, 23 Mar 2012 15:13:16 +0100
> From: khali@linux-fr.org
> To: tomasx@hotmail.com
> CC: lm-sensors@lm-sensors.org
> Subject: Re: [lm-sensors] IT8728 shows wrong CPU temperature
> 
> On Fri, 23 Mar 2012 15:06:11 +0100, Tomas Johansson wrote:
> > Now we are talking, thanks for the information. :)
> > I guess, my original intention with my letter wasn´t giving you more work but rather broadcasting that it might be a problem with the IT8728F support, i guess with 3.3 out we will soon see more usage of it. And maybe more people will report, or not...
> > 
> > With your experience what would you recommend.
> 
> First of all I'd recommend not dropping the mailing list from Cc.
> 
> > 1. Asssuming ~26 C is the real idle value
> 
> Yes.
> 
> > 2. fiddle with the lm sensors config file and add a couple of degrees
> 
> No.
> 
> > 3. Get a life and stop monitoring my fan speeds and temps
> 
> No. Monitoring is useful.
> 
> -- 
> Jean Delvare

Thanks, i will follow your advice.
 		 	   		  

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