Hi Phillip, On Wed, 2011-02-23 at 10:38 -0500, Phillip Susi wrote: > On 2/23/2011 12:53 AM, Guenter Roeck wrote: > > Actually, sysfanout (pwm1) can be configured for DC output. You should see > > the setting with pwm1_mode. If its value is 0, output is DC, otherwise > > it is pwm. pwm2 and pwm3 only support pwm mode. > > > > If configured for DC, the upper 6 bit of pwmX translate to output voltage. > > > > Motherboard pinout (per its datasheet) is a bit odd. Looks like only the CPU fan > > (pwm2) supports pwm mode. The other fan connectors don't have a pwm pin. > > Fan connectors are labeled PWR_FAN1, CPU_FAN, CHA_FAN1 and CHA_FAN2. CHA_FAN1 > > has a 4-pin header, but the 4th pin is labeled as "+5V", not pwm. > > That is odd. The 4th pin should either be pwm or no connect, not +5V. > The information is from the P8P67 Pro Manual. You can download it from the ASUS web site. Interesting is that the fan connectors on the P8P67-M are different - there are three 4-pin fan connectors, and the PWM pin on all of them is labeled as "PWM". > >>> Would it be possible to run pwmconfig and let us know what it reports ? > >> > >> It appears to agree with my assessment in that fan1 responds to pwm1. > > > > And pwm2 and pwm3 don't have an effect ? > > > > Also - just trying to make sure - if you change pwm1, does it have an effect on > > pwm2 and/or pwm3 ? It should not, but who knows. And what are the values reported > > by pwm2 and pwm3 ? > > I was just playing directly with the knobs in /sys rather than running > sensors or pwmconfig. Setting pwm2 and 3 to zero had no effect. > Setting pwm1 to zero caused fan1 and I think it was fan4 to drop to 0. > fan2 and fan3 were still reading as spinning, though I am pretty sure > that only one fan was actually still spinning. I'll open the case > tonight and figure out which fan was connected to which header. Difficult to imagine that two fans would show spinning if only one does. I would think that if you drop pwm2 down to 0 (and of course set its mode to manual) should result in fan2 speed dropping, and CPU temperature to go up. This actually leads to the next question: What temperature changes do you see after playing with pwm settings ? If the CPU fan is affected, I would think that CPU temperature should go up pretty fast. Thanks, Guenter _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
