Prestigio Nobile 157 ACPI - overheating

[Milan Bartos]

Thank you very much for this comprehensive information about processors. I 
will try clean my laptop (he is more than 2 years old). And i will be calmer 
(quieter ?). So once again thank for Your instructions and Your time.
Milan   

Dne Monday 01 of October 2007 20:18:52 Kevin Oberman napsal(a):
> > From: Milan Bartos <merlyn500 at gmail.com>
> > Date: Mon, 1 Oct 2007 19:03:15 +0200
> > Sender: owner-freebsd-acpi at freebsd.org
> >
> > Hi. I have laptop Prestigio Nobile 157 and i am running 6.2-STABLE.
> > Kernel is GENERIC. I have my proc dev.cpu.0.freq=1000 to have temperature
> > about 54 Celsius. If a have dev.cpu.0.freq=1700, temperature is over 70
> > Celsius. Is this bug, unsuported acpi device or attribute my laptop?
> > My dmesg following:
>
> [-snip-]
>
> > Please, help me, all you will need (some sysctls or anything else) i
> > will send you.
>
> OK. People need to learn a bit about the normal temperatures of modern
> CPUs (as well as how they are measured).
>
> You have a 1.6GHz Pentium-M. The CPU temperature is measured on the
> silicon by a single junction that is tied to two pins on the
> package. The temperature you see is going to be higher than whet you saw
> on many older systems with a temperature sensor mounted under the CPU in
> the socket. These showed a lower temperature due to the combination of
> convection and thermal conduction.
>
> Your CPU is most likely a 735. If so, it is speced for operation to 100C
> and thermal shutdown forced at 125C. 70C is not really all that hot. My
> system tends to idle at about 55C and, during a big build
> (e.g. buildworld or openoffice.org) will climb to about 85C. This is higher
> than I used to see, but I suspect I need to remove the keyboard and
> clean the heat sink. Dust accumulation can really impact thermal
> transfer and the laptop is now 2.5 years old.
>
> Really, what you are seeing is pretty normal. You can see what the
> vendor thought was too hot by looking at 'sysctl hw.sysctl.thermal'.
> Look at values for PSV and CRT. PSV is when the system should start
> aggressive thermal control by forcing the performance down. CRT is when
> the systems should alarm and, depending on configuration, start a
> shutdown.
>
> On my 2G Pentium-M I see:
> hw.acpi.thermal.tz0._PSV: 94.5C
> hw.acpi.thermal.tz0._CRT: 99.0C
>
> So even 80C is not excessive. Just very uncomfortable if you really have
> the laptop on your lap.