Management of Thermal

[Norberto Meijome]

On Mon, 08 Oct 2007 15:41:16 +0200
Lars Engels <lme at FreeBSD.org> wrote:

> Do you have Windows installed on that Notebook? How warm does the CPU  
> get there? Or with a Linux live CD?

hey :) 
trying to follow up each suggestion as it arrived....

I tried Knoppix (5.1.1, 2007-01-04, kernel 2.6.19, after trying with knoppix
3.8 and realising it was a bit old...though not that much after all).
 My knowledge of linux's default support is a bit
limited - it seems cpu throttling (the equivalent of powerd) is not enabled by
default, so the core temperature in my laptop was hovering around 80. (compared
to 54 right now under freebsd with some minimal configuration outside of
defaults)

Anyway, I found the following pages which are  quite interesting:

http://www.thinkwiki.org/wiki/How_to_control_fan_speed ThinkPad Z60t, Z60m (fan
levels RPM: 1-2 = ~1700, 3-5 = ~2800, 6-7 = ~3500)

http://forum.thinkpads.com/viewtopic.php?p=158780&sid=f35af9a2972edda7460c433ffa75e75e
refers to pushing fans to 4.5K, and to what normal behaviour is

https://sourceforge.net/project/showfiles.php?group_id=153962 referred from the
previous post

http://www.thinkwiki.org/wiki/How_to_control_fan_speed 

the last one was a great one. It describes the latest support for fan control
in linux' acpi_ibm. Including how to enable it in experimental mode for older
kernels (such as the one Knoppix runs). so, i tried this :

http://www.thinkwiki.org/wiki/How_to_control_fan_speed#Using_a_stock_kernel

and it worked a treat.

The fan kicked off nicely... and seriously aggressively
when disengaged (similar to how the fan goes when you just power up the laptop).
So it seems these guys + gals @ penguin land are onto something good.

Does anyone know if their work can be leveraged for *BSD ? or maybe this
support is already in -CURRENT?

Cheers,
B
_________________________
{Beto|Norberto|Numard} Meijome

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