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Re: Help: Machine says it's running hot



On Wed, 2006-10-25 at 10:34 -0500, Arthur Pemberton wrote:
> On 10/25/06, Arthur Pemberton <pemboa gmail com> wrote:
> > I got messages saying that the machine was running hot on several
> > occasions. The first time, I shut down the machine, check thed the
> > temp in the BIOS (68 degrees C) and then proceeded to clean out the
> > CPU fan, and dusted teh rest of the machine.
> >
> > The second time I just restarted to the BIOS to check the temp again
> > myself: 74 degrees C Both these temps are supposed to be within the
> > okay range of my Intel Celeron running at 2.8 GHz.
> >
> > Please advise on what could be causing this, the message (pasted
> > below) are very unsettling.
> >
> > ======================================================
> > Oct 25 01:38:00 Watson kernel: CPU0: Temperature above threshold
> > Oct 25 01:38:00 Watson kernel: CPU0: Running in modulated clock mode
> > Oct 25 01:38:03 Watson ntpd[2569]: kernel time sync enabled 0001
> > Oct 25 01:38:05 Watson kernel: CPU0: Temperature above threshold
> > Oct 25 01:38:05 Watson kernel: CPU0: Running in modulated clock mode
> > Oct 25 01:38:10 Watson kernel: CPU0: Temperature above threshold
> > Oct 25 01:38:10 Watson kernel: CPU0: Running in modulated clock mode
> > Oct 25 01:38:15 Watson kernel: CPU0: Temperature above threshold
> > Oct 25 01:38:15 Watson kernel: CPU0: Running in modulated clock mode
> > Oct 25 01:38:20 Watson kernel: CPU0: Temperature/speed normal
> > Oct 25 01:38:25 Watson kernel: CPU0: Temperature above threshold
> > ======================================================
> >
> > --
> 
> UPDATE
> 
> This all occurs when the machine is under load. It happened last when
> I was doing a sha1sum of the FC6 DVD imames. The case has been wide
> open for weeks now. The room isn't warm either.
> 
> But lm_sensors did show the CPU at 80 degrees C whehn the messages showed up.
> 
> Please advise.

80 deg C seems a bit hot, and you say you have cleaned the fan/heatsink.

1. Is the fan running at full speed?  If it starts running slow this can
happen.  The speed may not be obvious, but often bios can report the
speed it is running.  It also may start making some noise as bearings
wear out.
In another post you show the fan as running at abt 2700.  This may be
OK, and it may not.  What has been the normal fan speed in the past?
If this is a fan that should be running at about 4000 - 5000 rpm then it
needs replaced. If it normally runs at 2700 (some do) then it is fine.

2. Have you checked the thermal grease/pad between the CPU and the heat
sink?  If that starts to lose its conductivity the CPU will start to
heat up.  A little new grease there is cheaper than a new CPU.


> -- 
> Fedora Core 5 and proud
> 


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