CPU temp AC vs Battery

[Eric Anderson]

On 05/01/07 14:26, Eric Anderson wrote:
> On 05/01/07 14:05, Nate Lawson wrote:
>> Eric Anderson wrote:
>>> On 04/26/07 09:52, Eric Anderson wrote:
>>>> Hi everyone,
>>>>
>>>> I've just noticed something very odd.  On my Dell D820 laptop, when
>>>> running off AC power from boot, by idle CPU temperature sits around 58C.
>>>>
>>>> If I unplug the power, and then plug it back in again, it will drop
>>>> down to around 49-50C within a minute or two.  It will stay there. 
>>>> With or without powerd running.
>>> Another note:
>>>
>>> If I boot up without the AC adapter plugged in, it still runs hot.  Only
>>> the transition from AC -> battery seems to make a difference.
>>>
>>> Anyone with some ideas??
>> Does the temp change at all or is it stuck at 58C?  If stuck, maybe the
>> reading is incorrect and something in the AC line transition kicks the
>> EC back into operation.
> 
> The temp does change, about 10C.


Hmm.. Seems also that my performance is reduced quite a bit.  Doing some 
rather lame CPU benchmarks (ubench -c -s), seems that I get a score of 
around 200k on AC before unplugging, and about 104k after 
unplugging/plugging back in.  It definitely feels slower too..

I don't see any speed changes or anything obvious in sysctl output.


>> If it changes, then perhaps something is generating a lot of interrupts
>> (perhaps SMI or SCI irqs).  More debug prints from the acpi-ca Notify
>> routine caller would help zero in.
>>
> 
> Just add some printfs in there and recompile/reboot?
> 
> 
> Eric
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