A really quick workaround is to issue:
sudo killall klogd
This will stop the hard drive grinding (if you experience that), but
that still doesn't fix the infinite loop (most likely) in kacpi_notify
which hogs a lot of CPU power. You can renice it to priority 19 to make
it not as bad.
If you don't mind recompiling your kernel, you can go to
drivers/acpi/thermal.c, find this:
static void acpi_thermal_check(void *data)
{
and add right after it:
printk(KERN_WARNING PREFIX "Bypassing acpi_thermal_check\n");
return;
...
This will disable thermal checking, meaning the fan won't come on when
the processor gets busy (don't blame me if your CPU overheats, which it
probably won't). I did this myself, and it got rid of the kacpi_notify
thrashing completely.
If you're a kernel developer, see if you can find the infinite loop in
acpi_thermal_check :)
--
runaway kacpi_notify
https://bugs.launchpad.net/bugs/75174
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