From: Len Brown <len.brown-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
To: susinho-32FzPoaopq1AfugRpC6u6w@public.gmane.org
Cc: ACPI Developers
<acpi-devel-5NWGOfrQmneRv+LV9MX5uipxlwaOVQ5f@public.gmane.org>,
linux-thinkpad-l7BEYHA5S10i5T99jlK1Sh2eb7JE58TQ@public.gmane.org,
Zhenyu Z Wang
<zhenyu.z.wang-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org>
Subject: RE: fan always on: ACPI on IBM ThinkPad R51
Date: 01 Sep 2004 13:08:17 -0400 [thread overview]
Message-ID: <1094058497.2053.8.camel@d845pe> (raw)
In-Reply-To: <20040901100349.4B7A28254-1pm5EDj67X3XwkDZ9D75p87Q1tIk23pb@public.gmane.org>
On Wed, 2004-09-01 at 06:05, susinho-32FzPoaopq1AfugRpC6u6w@public.gmane.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-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org> escribiu:
>
> >There is no fan device in your dsdt. That means ACPI fan driver couldn't
> >handle it.
> >
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next prev parent reply other threads:[~2004-09-01 17:08 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-08-31 19:05 fan always on: ACPI on IBM ThinkPad R51 Wang, Zhenyu Z
2004-09-01 10:05 ` susinho-32FzPoaopq1AfugRpC6u6w
[not found] ` <20040901100349.4B7A28254-1pm5EDj67X3XwkDZ9D75p87Q1tIk23pb@public.gmane.org>
2004-09-01 17:08 ` Len Brown [this message]
-- strict thread matches above, loose matches on Subject: below --
2004-08-31 15:06 susinho-32FzPoaopq1AfugRpC6u6w
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