CPU temp AC vs Battery

[Eric Anderson]

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.

> 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