I have a complement :

"it seems like the fan stuff is on the SMBus which is at address 7A. The speed can be read from register 11 and written to register 10."
I don't know how to use this information.

Adachi, Kenichi wrote:

Hi,

There isn't any method to control the Fan in the dsdt ACPI 
table on my 
computer (DELL SmartPC/SmartStep).
Thanks to the ACPI Specs, I have implemented this code and 
there is no 
problem with the compilation. ACPI Linux driver indicates me that it 
finds a method for my two logical fans (one fan with 2 speeds). But I 
think that the adress (the namespace maybe EC0) is not good 
so I can't 
control it. How can I find the good region for my fan ?


Can you be more specific here:

- What was the original status/problem? (There was nothing w.r.t. Fan
control at all in your original DSDT, but your machine has been kept
chilled by Fan, correct?)
- What steps did you go through? (Trying to control Fan via ACPI by
adding your own methods without knowledge as to how your Embedded
Controller interacts with Fan controller etc.?)

The entire DSDT, both original and modified, will be required for
further investigation, but honestly speaking, there's little, if any,
hope of success...

Thanks,
- Adachi, Kenichi 





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