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List:       acpi4linux
Subject:    RE: [ACPI] hp omnibook xe4500 fan control
From:       "Li, Shaohua" <shaohua.li () intel ! com>
Date:       2005-06-27 1:35:52
Message-ID: 16A54BF5D6E14E4D916CE26C9AD30575026989E9 () pdsmsx402 ! ccr ! corp ! intel ! com
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Hi,
>
>Hello, List!
>
>I'm having a problem with HP's Omnibook XE4500.
>
>I cannot control the fan using its /proc/acpi interface. There is a fan
>entry and I can try to set some options, however - they are not set
>effectively (seems like Linux isn't in control of the fan). I'd like to
>set the trip_points to some values so that the fan doesn't come on so
>often. Any hints on where to start? Or it is not possible on Linux
anyway?
>
>There is a fan.exe on the diagnostic partition which switches the fan
on
>and then off for diagnose purposes, so it _should_ be possible to
>control the fan by software.
IIRC, fan device is a dummy device in many systems. That is acpi can't
really control fan. Your system might be such one. Sure, it's just my
guess :), did you see any error messages printed out? fan.exe might use
other methods like i2c.

Thanks,
Shaohua


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