[ltp] RE: [ACPI] fan always on: ACPI on IBM ThinkPad R51

[linux-thinkpad@linux-thinkpad.org]

Hi all again.

I called the IBM technicall service in order to solve the prob. They said
I must send them my machine, what I done. They replaced the old fan -!-
by a new one, but -of course- the problem is still the same.

Now I re-called again technicall service to tell them the problem
remains, this time talking about the DSDT absence of a fan device.
And... surprise:

They said me that this is an Intel issue they cannot solve, because my
ThinkPad has a low rotation hard disk -?=BF- and a Centrino Intel
processor... so they said me to having knowledge of the problem, as
Intel had address them instructions to define that fan's behaviour:
starting very early and not stopping to maintain 'optimal performance'.

I can't believe this. Any similar experience here? What can be done?
Perhaps requesting them for a BIOS update wich adds a fan device to the
DSDT can help? Or is it absolutely dissapointed?

Thank you.

O 2/9/2004, "Len Brown" <len.brown@intel.com> escribiu:

>On Wed, 2004-09-01 at 06:05, susinho@ultreia.org wrote:
>> Thank you for this info.
>>
>> I opened the laptop and found a three wire connector to the fan, wich
>> usually means speed control by BIOS. Disconnecting the fan, a "Fan
>> failure" appears and booting process stops. So I supose the fan speed
>> and switches are controlled by non-ACPI parts of the BIOS.
>>
>> In this case, adding a fan device in the dsdt could make ACPI handle the
>> fan?  Is this possible, or the only way is to modify the BIOS?
>
>Such an ACPI device would need methods, and those methods would
>read and write platform-specific hardware registers.  This is the
>job of the BIOS writer at IBM.  But apparently on this model IBM
>has a non-ACPI means to handle the fans, probably an embedded
>controller.
>
>-Len
>
>> O 31/8/2004, "Wang, Zhenyu Z" <zhenyu.z.wang@intel.com> escribiu:
>>
>> >There is no fan device in your dsdt. That means ACPI fan driver couldn't
>> >handle it.
>> >
>
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