Eventually, I've found that it was PowerPlay and not ACPI that was causing this 
issue....PowerPlay is used by ATI card to reduce consumption of graphic 
cards....and with open source drivers, it's not implemented yet...so I've 
installed proprietary drivers and now, the fan is running at normal speed and 
the general temperature is even cooler...
Something positive : powerplay will be soon available with latest branch of 
open source drivers ;)

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Toshiba satellite L350/L505 fan regulation problem in Ubuntu 8.10/Ubuntu 9.10
https://bugs.launchpad.net/bugs/321578
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