Linux ACPI Configuration

Question

In my Fedora Core Linux (kernel 2.6.16.11), I've been trying to test the auto-shutdown mechanism associated with the CPU temperature. It does not automatically shutdown properly.

If my current processor temperature is 50 C and I set my ACPI configuration to shutdown at 55 C by executing the following commands at the prompt:

echo -n "55:50:45:40:35:30" > /proc/acpi/thermal_zone/THRM/trip_points
echo -n "1" > /proc/acpi/thermal_zone/THRM/polling_frequency
echo -n "0:0" > /proc/acpi/processor/CPU1/limit

Then running any software which brings my temperature way past 55 C, the system doesn't automatically shut down like I need it to.

But as long as the temperature is above 55 C, if I run the following command again:

echo -n "55:50:45:40:35:30" > /proc/acpi/thermal_zone/THRM/trip_points

Then the system shuts down immediately like I want it to! Does anyone know why the system doesn't go down on its own?

Note that I do have '/usr/sbin/acpid' running.

Answer 1

After running those 3 echo 's, try cat /proc/acpi/thermal_zone/THRM/trip_points and see what it's set to. My guess is that it gets reset after you set the other two, so I suggest you run the first echo you wrote only after the other two and it might help.