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Bug#697548: linux-image-3.7-trunk-amd64: temperatures are too high on Lenevo T420



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On Sun, 2013-01-06 at 21:04 +0100, gpe wrote:
> Package: src:linux
> Version: 3.7.1-1~experimental.2
> Severity: normal
> 
> Dear Maintainer,
> 
>    * What led up to the situation?
> 
>    updating with kernel 3.7.1. My machine is a Lenovo T420 (model
>    4180AT9)
> 
>    * What exactly did you do (or not do) that was effective (or
>      ineffective)?
> 
>      starting the system and logging into gnome session
> 
>    * What was the outcome of this action?
> 
>    sensors reports temperatures for cores and thermal zone which are
>    between 52°C and 60°C

This is not really very hot.

>    * What outcome did you expect instead?
> 
>    when running with kernel 3.6.9 the temperatures are under 42°C
[...]

Did you test this immediately after rebooting?  I would expect an
upgrade and reboot to make the CPU heat up.  You would have to leave it
idle for some minutes to make a proper comparison.

If the temperature really stays higher with the newer kernel version
then please install linux-tools-3.7 and generate a performance report:

# running as root:
perf record -g -a sleep 60
perf report -g > perf.txt

Then send the report file perf.txt.  (This report will list most
commands running on the system, so you may wish to remove any sensitive
information first.)

Ben.

-- 
Ben Hutchings
Sturgeon's Law: Ninety percent of everything is crap.

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