acpi_task_0 consuming cpu resource

[C. C. Tang]

> I have one of these boards, but I haven't seen this with -CURRENT.
> There are known fan issues with some of the BIOS revisions for these
> boards.  I would make sure you have the latest BIOS update and see if it
> resolves your issue.

I have updated the BIOS to rev.0182(20090528). It seems that new rev. 
has been released about 2 weeks ago but I haven't updated it yet.

I am using 7.2-RELEASE. In fact this problem exists when the board is 
newly bought(BIOS rev.099 if I remembered correctly). But at that time I 
didn't have case fan so I simply disabled that.

And it seems that the problem may not always happen. (happen when fan 
speed need to change?) I rebooted once an hour ago when the system 
temperature become stable and the problem does not happed till now.

Thanks,
C.C.