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How can I set my processor fan to 100% in linux?

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Why, are you using your PC for HVAC? – Aki Dec 24 '10 at 16:26
    
No, my computer often overheats and fans are not well configured. – oneat Dec 24 '10 at 18:57

You'd be better to just improve your case airflow or get more fans, but anyway...

  1. Sometimes you can set this in your BIOS (either it will ask for a percentage or will allow you to disable smart fan control, which will usually make the fans run at 100% all the time).
  2. You can set the fans to go at 100% all the time using ACPI, the way to do that will vary depending on the computer, but you can get some good ideas about how to do it from here (those are specifically for IBM Thinkpad AFAIK, but it should give you some good ideas on how to perform the same action on your own computer).
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