On 04/12/11 16:30, lm-sensors-request@xxxxxxxxxxxxxx wrote: > Hi Charles, > > Please keep the list CC'd. Oops! Sorry. >> > Tested; no error messages and GKrellM shows sane processor core >> > temperatures and fan speeds. >> > >> > Sorry for the incomplete initial report: >> > * I had applied the suggested workaround (thanks Jean and Guenter). > Hmm. Please test the updated version of the script _without_ the > workaround applied. That's the whole point of the update. That's how I did test the update. Should have made clear. > Most likely because the CPU fan header is a 4-pin header, and the Intel > CPU fan has 4 wires, while the case fan headers are 3-pin with a 3-wire > fan. > > On 4-pin headers, the PWM signal is separated from the power. So you > can't control a 3-wire fan plugged in a 4-pin header (the PWM signal is > on the unconnected pin [1].) This also explains the minimum speed of > 4-wire PWM-controlled fans. This is per design. If the minimum speed > doesn't please you, you have to either buy a different fan with a lower > minimum, or lower the fan voltage using a serial resistor (Noctua > amongst several other fan vendors includes such resistors in many of > their product packages.) > > [1] Some boards have jumpers that will let you turn a 4-pin fan header > into a 3-pin one. You loose the benefits of 4-wire fans (such as linear > fan speed control and reliable readings at low speed) but are no longer > affected by the arbitrary fan minimum then. > > Indeed, it is only recommended to connect similar fans to the same > control output. There's a reason why board makers often connect the > case fans together, but usually have a separate fan control for the > CPU(s). Thanks for explanations, Jean :) _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
