Does the Pentium M Processor indirectly control fan speed (laptop)

[Sanjay Punjab]

I own a fujitsu lifebook and the fan seems to have a life of its own.
Turning on and off randomly and racing periodically. It is hard to
explain, but the operating is erratic and my friend's identical laptop
does not suffer from this problem. The laptop has a Pentium M
processor. Fujitsu already replaced the motherboard (including CPU)
and the fan & heatsink, but still the problem exists. I am wondering
if the problem could be the hard drive, especially when the erratic
operation seems to coincide with hard drive operations.
The hard drive has that new S.M.A.R.T. interface that reports
temperature. I am wondering if the Pentium M processor is giving a
false signal to the fan controller chip based on faulty temperature
data from the hard drive via the S.M.A.R.T. interface.
I would appreciate any info on this. Thanks

 

[Andre]

I own a fujitsu lifebook and the fan seems to have a life of its own.
Turning on and off randomly and racing periodically. It is hard to
explain, but the operating is erratic and my friend's identical laptop
does not suffer from this problem. The laptop has a Pentium M
processor. Fujitsu already replaced the motherboard (including CPU)
and the fan & heatsink, but still the problem exists. I am wondering
if the problem could be the hard drive, especially when the erratic
operation seems to coincide with hard drive operations.
The hard drive has that new S.M.A.R.T. interface that reports
temperature. I am wondering if the Pentium M processor is giving a
false signal to the fan controller chip based on faulty temperature
data from the hard drive via the S.M.A.R.T. interface.
I would appreciate any info on this. Thanks

I owned a Toshiba laptop, and a BKPW Note Pro like this, its a
"feature" that keeps the processor at the same temperature while
maximising battery life (reducing the fan speed during low CPU usage,
and increasing it when the CPU is being thrashed, such as a lot of
3D).

You might try looking in the BIOS for anything like "Fan mode
settings" or similar, sometimes they give you the option of turning
off the demand based fan speed.

-A