acpi_task_0 consuming cpu resource

[Robert Noland]

On Fri, 2009-08-07 at 10:42 +0800, C. C. Tang wrote:
> Hi.
> 
> I have a system with Intel D945GCLF2 motherboard with Atom CPU.
> I found that when I enable auto speed regulation of case fan.
> FreeBSD will have a process "acpi_task_0" which consume all resource of 
> one of the core of the CPU.
> The fan seems fail to change RPM itself. Is there any solution to this 
> problem without disabling the auto speed regulation?
> 
>    PID USERNAME       THR PRI NICE   SIZE    RES STATE  C   TIME   WCPU 
> COMMAND
>      7 root             1   8    -     0K     8K CPU1   0 124:29 100.00% 
> acpi_task_0
>     12 root             1 171 ki31     0K     8K RUN    0 177:23 95.26% 
> idle: cpu0
>     11 root             1 171 ki31     0K     8K RUN    1  61:20  1.07% 
> idle: cpu1

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.

robert.

> Thanks very much.
> C.C.
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-- 
Robert Noland <rnoland at FreeBSD.org>
FreeBSD