Xserve G5 keeps shutting down

[Nathan Whitehorn]

On 06/29/11 15:11, Paul Mather wrote:
> On Jun 29, 2011, at 11:25 AM, Paul Mather wrote:
>
>> On Jun 27, 2011, at 10:41 AM, Nathan Whitehorn wrote:
>>
>>> On 06/27/11 09:28, Paul Mather wrote:
>>>> On Jun 25, 2011, at 8:52 PM, Nathan Whitehorn wrote:
>>
>>>> What is odd, to me,  is that this power-off occurred even
>>>> after commenting out the shutdown line in the thermal power
>>>> management driver.  So, it must be something else that is
>>>> forcibly powering off the system, maybe something in
>>>> OpenFirmware, rather like some PC BIOSes will initiate a
>>>> power-off when temperatures exceed critical. But, what is
>>>> definitely odd is that temperatures don't seem to get so high
>>>> as to be critical, so perhaps it is some other hardware state
>>>> that is triggering the power-off?
>>>
>>> Yes, something like that seems likely, either some strange
>>> firmware thing or the PMU microcontroller becoming unhappy. A few
>>> more things to try: 1) Does setting machdep.manage_fans=0 from
>>> the loader change anything?
>>
>> I am trying that now.
>
>
> Just to follow up myself, I can report that I tried that and it
> eventually powered off the machine uncleanly, too, so no ultimate
> change in outcomes there. :-(
>
> I'm beginning to wonder if this has anything to do with the fans or
> the temperature.  Tomorrow I'll power on the system and let it run
> idle and see if it still powers off.
>
> Do you think it would be worthwhile resetting the PMU?

That's unfortunate. Can you go through SVN history and make sure that 
the revision before the thermal control code worked?
-Nathan