When I run the pwmconfig script everything seems to be okay. It detects correlations between pwm1, pwm2, pwm3, and fans/sensors. One thing I've noticed is that pwm1 and pwm3 both seem to map to the same fan. Maybe this contributes to the problem I'm seeing.

When pwmconfig asks to generate detailed correlations, (and I type yes), it does what it should and the fan speed ramps down as pwm values drop.

HOWEVER when setting up temp/fan correlations and asked to press "t" to test pwm values, the fan continually runs at full speed and never powers down.

Of course I could just manually enter pwm values and do it by trial and error, but I'd rather trust the test functionality...
Is there something I'm doing wrong?

The chipset is it8718-isa-0228, which reports the correct values using the "sensors" command.

Thanks!