@pawel thanks for your tips.
But it doesn't seem to work for me. Now after waking up from STR, my fan is 
high up again
$ uname -r
2.6.27-14-generic
$ cat /proc/acpi/fan/*/state
status:                  off
status:                  off
status:                  off
status:                  off
status:                  on

After a few trials, it seems to me that the argument "3" turns off the 
corresponding fan while "0" turns them on.
It turns out the naughty fan is FAN0, not FAN4.
$ echo 0 | sudo tee /proc/acpi/fan/FAN0/state
0
And then the noise vanished.
I wonder if my FAN4 is nonexistent, coz having it on doesn't yield much noise...

The script in resume.d seems to be just doing the opposite: upon resuming, it 
turns each fan on right after turning them off.
The effect is funny though, contrary to its intension, only FAN4 remains "on" 
when I inspect the fan states.

Anyone give some pointers or shed more lights on this?

-- 
Laptop Fan always on after resume from suspend to RAM
https://bugs.launchpad.net/bugs/77370
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