Hi,

I have a similar problem on the Amilo A7640W with Ubuntu 7.10.

The ACPI doesn't support FAN control

( I have disassembled the dsdt and no reference to the FAN from what I
could see : http://pastebin.com/f11e37b0c )

My processor temperature is monitored by the K8temp driver (It's a
Sempron 3000+).

the temp for the mobo ( I suppose )  is located at :  
/proc/acpi/thermal_zone/THRM/
the temp fro the proc is located at 
/sys/device/pci0000:00/0000:00:18.3/temp1_input

I am still in search of fan speed settings because I have realized my
fan is spinning at 4 different speeds:

max speed when CPU temp is 75C / lower speed at 64C / lower speed at 61C
/ lowest speed at 54C.

However, I don't know yet what controls the speed and the fan is still
very loud at its lowest speed.

-- 
Fan spins at full speed all the time on various Fujitsu Siemens Amilos
https://bugs.launchpad.net/bugs/57617
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