[lm-sensors] IT8728 shows wrong CPU temperature

Tomas Johansson tomasx at hotmail.com
Fri Mar 23 10:38:57 CET 2012



> Date: Fri, 23 Mar 2012 10:05:42 +0100
> From: khali at linux-fr.org
> To: tomasx at hotmail.com
> CC: lm-sensors at 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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