Temperature too high when high overload
jb.1234abcd at gmail.com
Mon Aug 27 16:38:06 UTC 2012
Christian Mangin <christian.mangin <at> gmail.com> writes:
> 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).
> > ...
> 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)
> You should try to adjust _PSV to be significantly lower (> 15-20C) than
> the _CRT (critical shutdown temp) so that _CRT is never reached.
I too have the same problem (Lenovo dual core r61i).
You should see the relevant data before making any changes - below it is
This is my data:
$ sysctl -a | grep -i thermal
hw.acpi.thermal.tz0._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
hw.acpi.thermal.tz1._ACx: -1 -1 -1 -1 -1 -1 -1 -1 -1 -1
dev.acpi_tz.0.%desc: Thermal Zone
dev.acpi_tz.1.%desc: Thermal Zone
dev.p4tcc.0.%desc: CPU Frequency Thermal Control
dev.p4tcc.1.%desc: CPU Frequency Thermal Control
As you can see in my case:
which is NOT available (so obviously any settings in tz0 zone are irrelevant).
This is explained here:
If set to 1, passive cooling is enabled. It does cooling without
fans using cpufreq(4) as the mechanism for controlling CPU speed.
Default is enabled for tz0 where it is available.
In my case tz1 zone is available and active.
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