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List:       netbsd-port-i386
Subject:    Re: [ACPI] Acer Aspire 1700
From:       BERTRAND Joel <joel.bertrand () systella ! fr>
Date:       2010-04-06 12:35:12
Message-ID: 4BBB2A80.2010002 () systella ! fr
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Julio Merino a écrit :
> On Tue, Apr 6, 2010 at 12:33 PM, BERTRAND Joel
> <joel.bertrand@systella.fr>  wrote:
>> Jukka Ruohonen a écrit :
>>>
>>> On Tue, Apr 06, 2010 at 11:53:08AM +0200, BERTRAND Joel wrote:
>>>>
>>>> As it worked fine with Solaris, I suppose that this control is done
>>>> by operating system, but I don't understand why CPU fan does not start
>>>> when
>>>> ACPI is disabled. Is there any workaround or patch ? I haven't found any
>>>> information.
>>>
>>> On some systems the fan is controlled by the operating system via ACPI.
>>> Consequently, if the latter is disabled, it is possible that the fan does
>>> not work. The temperature threshold for "active cooling" by a fan is
>>> generally imposed by the firmware.
>>>
>>> The question is: why you need to disable ACPI?
>>
>>         I have tried to disable ACPI to check if fan speed is controlled by
>> ACPI. As CPU is to hot, my first idea was to force fan action.
>
> Why do you think the CPU is too hot?  I've seen the CPU in several
> MacBooks reach 75C+ frequently, and the fans don't kick in until then.

	Because bottom of laptop is very hot (more than 70 °C).

	JKB
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