I have the same problem on an emachines 370 desktop. The CPU fan never
appears to come on and it overheats when doing intensive work (Last
time, in the middle of regenerating an initramfs during an upgrade!).
The fan works fine in Windows XP, and worked under previous versions of
Ubuntu (I think Hoary - but not too sure). Coincidentally ACPI reports
bogus temperatures for the CPU
~$ cat /proc/acpi/thermal_zone/THRM/temperature
temperature: -267 C
~$ acpi -t
Thermal 1: passive , 4294967040.0 degrees C
I've also added this to bug 54554 since it seems similar [If not a dupe]
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CPU fan not activating on HP NX6125
https://launchpad.net/bugs/24308
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