I realized that, when monitoring the real cpu temp. with gkrell and lm-sensors, when it gets to 75 C, if you restart the system there is a great chance for the fan to start working again (and then it never stops - acpi -t shows 70 C)
I realized that, when monitoring the real cpu temp. with gkrell and lm-sensors, when it gets to 75 C, if you restart the system there is a great chance for the fan to start working again (and then it never stops - acpi -t shows 70 C)