I have also problems on a L3000D with a fan that shows erratic behavior.
Yet different from yours. But could you please post the content of
/proc/acpi/processor/CPU0/power in bug #157407 as I'm "investigating"
several ACPI problems that became much more appearant with 2.6.22.

And a possible fix to your Problems could be a fixed DSDT. 
You could take a look at: https://help.ubuntu.com/community/ACPIBattery
There is described how to fix a DSDT an use it as a substitute to the one in 
the BIOS.

The behaviour of my laptop was the following: If the CPU Tempretur dropped 
below 35°C, what was usual every cold start after a pause, the fan went to full 
speed stayed there and the cpu became abysmal slow. 
If it stayed above this level from the beginning  the fan ran slowly till the 
system had booted up and the colling became effectiv enough to cool it below 
35°C and bang. 
I located the variable in the DSDT that encoded this 35° and lowered it to 16°. 
Now the fan never stops (staying slow), but the laptop can be used until a 
proper solution ist found.

-- 
Noisy fan and slowness after upgrade to Gutsy
https://bugs.launchpad.net/bugs/156995
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