Suspend works just fine with Windows XP/Vista. I've been trying around
with Intrepid (Ubuntu/Kubuntu) and Ubuntu Hardy and all of these
experience the problem. Currently,

$ uname -r
2.6.24-23-generic

For me, this workaround has not worked. After suspend resume the fan
states are set to 3. My only workaround for this has been to echo 0 to
the fan states, and then echo them back to state 3 and make sure that
polling is turned on.

After suspend resume acpi_listen does not show any events, even when
trip points are reached, thus without polling enabled the fans will be
spinning on whatever speed the bios sets them on suspend resume.

This however is a no-good solution, as even with polling, ACPI doesn't
update the trip points when a fan is turned on/off, which basically
results in the temperature bouncing +-2C around the active[2] trip
point, fans constantly turning on and off.

** Attachment added: "dmesg with boot, suspend and resume"
   http://launchpadlibrarian.net/25241515/dmesg.txt

-- 
Noisy fan after resume on HP 6735s (reproducibility about 20%)
https://bugs.launchpad.net/bugs/343128
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