2 core dumps

Mikael Ikivesi mikael.ikivesi at pp.inet.fi
Fri Feb 22 16:03:12 UTC 2008


On Fri, 22 Feb 2008 12:09:26 +0100
Dag-Erling Smørgrav <des at des.no> wrote:
> Your laptop overheats when running at its rated frequency?  That's
> your answer.  Hardware error.  Most likely incorrect application of
> heat transfer compound between the CPU and the heatsink, or blocked or
> defective fans.  If your CPU has overheated even once, you can't trust
> it any more, unless it has an automatic cutoff like Core and Core 2.
> 
> DES

Fans are working and clean. Dried silverpaste was replaced few weeks ago
as I cleaned heatsink..Everything works. As I wrote earlier it cannot
maintain 2.4Ghz constantly but has to speed down.



On Fri, 22 Feb 2008 08:17:24 -0500
"Alexandre \"Sunny\" Kovalenko" <alex.kovalenko at verizon.net> wrote:
> If "overheated" in this context means "initiated critical shutdown"
> neither statement needs to be true. For instance, there is the patch
> from Umemoto-san floating around acpi@ that enables use of passive
> cooling for the thermal zones other that tz0, and there is at least
> one model of laptop that I know of, which uses tz1 for its CPU. This
> means that FreeBSD *will not* handle passive cooling on such laptop
> and it might reach _CRT and shut itself down. Also, some
> manufacturers put _PSV dangerously close to _CRT, assuming that OS
> will take over in time, which might or might not happen in the real
> life.

Overheating in this case means my own judgement and usability. If I use
powerd and stress this machine by compiling lot of stuff in background
while doing some work this laptop heats a lot. Temperature seems
to stay between 85-95 degress and fans screams constantly. I have not
let it stay in that condition for long time, because I dont know if it
will shutdown properly if I let it heat more...if it heats more. Or
does it throttle down like with linux..

So the definaton would be:

Overheating is system getting uncomfortable to use (lot of noise and
the fact that my machine becomes something that cannot be called LAPtop)

AND this does NOT mean my laptop is toast(er)..


tz0 is my cpu and it show right values. When this laptop heats it seems
to be more like powerd related. 800-1800Mhz fans kick in every now and
then and keep system in sane temperature. Powerd seems to work better
if I set user.override and lower value to _PSV. It seems to kick machine
into constant loop of changing 800->1800 after heat has risen and then
stays there until compilation (or etc.) has finished. This way powerd
cab be used and my system works as usable LAPtop.

As currently I use this laptop mostly for writing and some desktop
publishing jobs I dont currently need powerd as I am comfortable with
lowest value and longes battery life.



And I guess this laptop throttles quite nicely to safe cpu freq when
it needs to. With linux I noticed that if let compiling (former gentoo
user) get too intensive and heat builds up machine goes to strange
frequency of 1920Mhz which is not available in any other way. And it
locks it as highest value that this machine is capable for
sometime and then releases it and lets cpu to go 2.4Ghz
(Or is this something that linux does without my knowing???)



On Fri, 22 Feb 2008 15:42:05 +0100
Dag-Erling Smørgrav <des at des.no> wrote:
> Right.  Your laptop is dead.  Deal with it.

Not yet accepting that as a fact ;)



And to get back to possible reasons for those coredumps I guess that
the fact that this machine rebooted and dumped at frequency of 800Mhz
that has NEVER overheated I cannot see heating as reason for them...

I am currently try to find out what causes them by doing lot of things
with X and without X to get the idea if this is caused by FreeBSD
itself or somehow by some new port behaving badly on FreeBSD.

And as this has not happened with linux I cannot blame hardware alone...





-Mikael



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