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. >>> 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. _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
