Problem with IBM Thinkpad T30 shutting down due to high temperatures

[Roland Smith]

On Mon, Aug 10, 2009 at 11:53:10PM +0200, Christian Walther wrote:
> Hello list,
> 
> for some time now my T30 shuts down due to temperatures exceeding the
> safe limit of 92 degrees celcius.
> Regardless to say that a 2GHz pentium4m powers the machine, and these
> chips are "well known" for high temperatures.
> But I'm unable to do anything that causes high load on the laptop:
> Building world or complex ports makes the system reach the limit
> within minutes. A few days ago I configured xcompmgr, which even seems
> to make the problem whorse (yes, composite extension is enabled).
> What I don't know is if this is a hardware error, or something caused
> by the kernel. I wrote a small script to monitor  dev.acpi_ibm.0.fan
> dev.acpi_ibm.0.fan_level, hw.acpi.thermal.tz0.temperature and
> dev.cpu.0.freq, and it sometimes appears that the temperature of the
> CPU rises, but the kernel doesn't decrease the clock in time.

If available, you can use acpi_thermal(4) to set the temperatures at which
atcive cooling engaves. Look for the sysctl 'hw.acpi.thermal.tz%d._ACx', where
%d is the core number and x is the cooling level. Or set the level manually
with 'hw.acpi.thermal.tz%d.active'.

Read the acpi_thermal manpage for more details.

Roland
-- 
R.F.Smith                                   http://www.xs4all.nl/~rsmith/
[plain text _non-HTML_ PGP/GnuPG encrypted/signed email much appreciated]
pgp: 1A2B 477F 9970 BA3C 2914  B7CE 1277 EFB0 C321 A725 (KeyID: C321A725)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: not available
Type: application/pgp-signature
Size: 196 bytes
Desc: not available
Url : http://lists.freebsd.org/pipermail/freebsd-stable/attachments/20090810/09c4f55a/attachment.pgp