thermal shutdown

hi,

my system: 2.6.3 acpi patched

I have noticed, that at some sudden point in time (especially when I am not working actively ( I mean using input devices )), I receive a thermal shutdown, because of a (false?) temperature value.

looking under /var/log/kern.log I found

jaques2:/var/log# cat  kern.log | grep  Critical
Feb 19 16:11:21 jaques2 kernel: Critical temperature reached (123 C),
shutting down.
Feb 19 16:11:22 jaques2 kernel: Critical temperature reached (46 C),
shutting down.
Feb 20 10:47:02 jaques2 kernel: Critical temperature reached (123 C),
shutting down.
Feb 20 10:47:02 jaques2 kernel: Critical temperature reached (44 C),
shutting down.
Mar  2 22:38:27 jaques2 kernel: Critical temperature reached (123 C),
shutting down.
Mar  2 22:38:27 jaques2 kernel: Critical temperature reached (44 C),
shutting do

this temperature always happens to be 123 C.
How is that possible?
I noticed that the acpi_thermal_critical method uses some kind of flag for enabled disabled, but apparently in any case the shutdown user space app (/sbin/poweroff) is called.
Should this only be the case when the temperature is too high and the flag (enabled) is set to != 0? Otherwise, what is the point in the enabled thing. [tz->trips.critical.flags.enabled]

As you can see from my kern.log, the second value is drastically lower, so could this be a weekness in the system, that one sporadically high value can trigger a shutdown?

thanks
-- Jakob

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