[gentoo-user] [OT overheat] How to cause shutdown on overheat

[reader@newsguy.com]

Group, I recently built a ventilated stucture around my 4 desktops to
try to quiet things down and get rid of the heat.

I made no provision for forced shutdown in case of overheat, which is
quite likely to happen if, for example the main ventilation fan went
down for some reason.

Well, that happened due to stupidity on my part with getting used to
the new setup.  I fired up a computer and neglected to turn the fan
on.  Then left it running overnight.

Well, given the confined space and very little/no ventilation (of my
homemade structure) the computer got hot...

Sometime this morning I see syslog messages written to tty that say:

  Message from syslogd@reader at Sat Sep 30 04:41:32 2006 ...
  reader kernel: CPU0: Temperature above threshold

  Message from syslogd@reader at Sat Sep 30 04:41:32 2006 ...
  reader kernel: CPU0: Running in modulated clock mode

[...]

Some kind of attempt by kernel to cool things down.  But will it
actually shutdown if it gets dangerously hot?

Further, how can I discover what temperatures were involved when this
happened?

Or can I set something to make a shutdown happen at a specific
temperature? 

A nicer solution would be somekind of added stand alone temperature
monitor in the enclosure that causes a controlled shutdown like one
gets with `shutdown -h now'.

Anyone here with some experience in this kind of thing that can steer me
to some good information?


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