linux-kernel - Re: Linux 2.6.25 (coretemp reads high temperatures)

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Message-Id: <200804231143.10875.maximlevitsky@gmail.com>
Date:	Wed, 23 Apr 2008 11:43:10 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	Len Brown <lenb@...nel.org>
Cc:	Matthew <jackdachef@...il.com>, linux-acpi@...r.kernel.org,
	torvalds@...ux-foundation.org, linux-kernel@...r.kernel.org
Subject: Re: Linux 2.6.25 (coretemp reads high temperatures)

On Saturday, 19 April 2008 04:51:48 Len Brown wrote:
> On Friday 18 April 2008, Matthew wrote:
> > Hi everyone, hi Linus,
> > 
> > congratulations on this new great kernel-release :)
> > 
> > I've another "regression" to report for 2.6.25:
> > 
> > it's concerning much higher temperatures being read out by the
> > "coretemp" kernel-module in comparison to 2.6.24* series
> > 
> > e.g. where temperatures were around 40-47°C they are now constantly
> > jumping around 55-70°C (even in idle !)

I just updated from 2.6.24 to 2.6.25
(I usually follow whole development cycle, but I was very busy, so I skipped 2.6.25 cycle)

I confirm this.
I *know* that temperatures reported now are wrong.

The reason is that bios did report same temperatures as coretemp in 2.6.24,
moreover some time ago I have run a cpu tool (don't remember its name) on windows
which similar to coretemp reads from each core directly, sensor data , 
and I noticed that temperature that bios reports is exactly the average 
temperature of both cores
(I had to run this on windows - intel haven't released 
drivers for their QST for temperature monitoring from bios - very sad)

And the driver did say in kernel log that TJMAX is 85C

Lets at least make a kernel option to override tjmax?

Best regards,
	Maxim Levitsky
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