Temperature too high when high overload

[Christian Mangin]

Le 27.08.2012 08:44, Mike Manilone a écrit :
> Hi all,
>
> I just switched from Fedora Linux to FreeBSD. But I noticed a problem,
> the CPU temperature will be very high when the load is high.
> Especially while I am building C++ programs. It shut down for even 3
> times while I was building Firefox/Thunderbird, just because of high
> temperature (86.5C).
>
> One of my friends told me, "FreeBSD doesn't support your ACPI well"
> but I noticed that while I'm not compiling ports, the temperature will
> be not too high.
>
> Just now I'm building LLVM, here's what I've seen:
>
>     > sysctl hw.acpi.thermal.tz0.temperature
>     hw.acpi.thermal.tz0.temperature: 84.5C
>     > pkill make
>     > sysctl hw.acpi.thermal.tz0.temperature
>     hw.acpi.thermal.tz0.temperature: 67.5C
>
> I'm using Dell Vostro 3400 laptop PC with FreeBSD 9.1-RC1.
>     > uname -a
>     FreeBSD bsd.laptop.mike 9.1-RC1 FreeBSD 9.1-RC1 #0: Tue Aug 14
> 04:25:06 UTC 2012
> root at farrell.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64
>
> There's my dmesg message: http://slexy.org/view/s21b7xTTsu
>
> Anyone knows how to fix this problem?  Thank you.
>
> Yours Sincerely,
> Mike Manilone
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Hello,

I used to have the same problem with my laptop (i5) and this can be
fixed by lowering the temperature threshold for passive cooling. (_PSV)

hw.acpi.thermal.user_override=1
hw.acpi.thermal.tz0._PSV=80C

You should try to adjust _PSV to be significantly lower (> 15-20C) than
the _CRT (critical shutdown temp) so that _CRT is never reached.

Christian