acpi, cpu fan control documentation

Matthew Garrett mjg59 at
Mon Jun 19 13:58:02 BST 2006

On Mon, Jun 19, 2006 at 06:03:09AM +0100, darx wrote:
> hi.
> I've searched the forums and visited the irc channel for information about the
> subject, unfortunately i wasn't able to find any.
> My laptop fan has a mind of its own and runs at full blast most of the time. My
> laptop is an acer aspire 1652 wlmi.
> Please direct me to the relevant documentation so that i can try fixing this.
> thanks..

If your fan is running all the time, that means that your BIOS believes 
that your fan should be running all the time. For a number of reasons, 
Linux tends to generate more heat on most hardware than Windows does - 
that will tend to manifest itself as the fan being on more. In some 
cases there are ways that you can override the BIOS, but that's likely 
to lead to your machine running hotter than it was designed to.

Matthew Garrett | mjg59 at

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