On Fri, Jan 27, 2012 at 11:41 PM, Guenter Roeck <guenter.roeck@xxxxxxxxxxxx> wrote: > Hi, > > On Fri, Jan 27, 2012 at 12:49:48PM -0500, CC wrote: > [ ... ] >> > >> > I tested all three fan outputs. Another thing is weird: pwm1_mode has >> > its meaning reversed (it's a 3-pin connector and the value 1 is DC >> > mode, in contrast to pwm2 and the documentation). >> > > You lost me there. pwm1 supports both DC and PWM. pwm1_mode should return 0 for DC mode, > 1 for pwm mode. The other pwm channels only support pwm mode on the NCT6776F, thus > pwm2_mode and pwm3_mode should both return 1. > > Are you saying that reading pwm1_mode returns 1, and pwm2_mode and pwm3_mode > both return 0 ? > > Thanks, > Guenter Maybe my reasoning is wrong... We have that * fan1 is linked to pwm1 * fan2 is linked to pwm2 * fan4 can only be monitored * fan5 is linked to pwm3 Only fan2 has a 4-pin connector and could thus be controlled by PWM, the others can only be controlled by voltage. Let's assume all fans to be in manual mode. * regardless of pwm1, fan1 runs at full speed when pwm1_mode returns 0 * the fan's speed can be controlled by pwm1 when pwm1_mode returns 1 So DC mode is only (correctly) activated when pwm1_mode returns 1. * fan2 stops when pwm2 returns 0 and pwm2_mode also returns 0 * fan2 runs slowly when pwm2 returns 0 and pwm2_mode returns 1 I interpret this as DC mode being used when pwm2_mode returns 0. * regardless of pwm3, fan5 runs at full speed whenever pwm3_mode returns 0 * the fan's speed can be controlled when pwm1_mode returns 1 So DC mode is only (correctly) activated when pwm3_mode returns 1. Regards, CC _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
