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

[linux-thinkpad@linux-thinkpad.org]

IBM technicall service says R51 are based in R50/p, wich has this problem
also:

http://www-307.ibm.com/pc/support/site.wss/MIGR-56504.html

so the "problem" becames now in a "feature". Incredible. IBM acronym
meaning is dangerously turning in Incredible BOFH Makers... Can't
believe it.

O 6/9/2004, "susinho@ultreia.org" <susinho@ultreia.org> escribiu:

>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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