My last computer was a SONY Vaio PCV-RX470DS and it had fan issues. I was able to download a patch from SONY's web site that helped. There is a fan control utility for your model PCV-RX640 at http://esupport.sony.com/perl/swu-do..._id=96&os_id=7
I'm not sure if this will help or how this utility works--i.e., whether it flashes the BIOS or runs as a stand alone program in Windows (I realize your problem with the fan speed happens when you are in Linux).
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Registered Linux User #391321
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