On Wed, Jun 27, 2012 at 06:18:09PM -0400, Arun Raghavan wrote: > Hi, > > > I need to get fairly fine grain control on my CPU fan speed for some > > > > experiments, but I am currently unable to set the fan speed below 1054 > > RPM. > > > pwmconfig confirms the same across the divisor range. Processor is > > i7-2600, > > > motherboard > > > > > > I tried setting pwm2_enable to 1 and pwm2 to 1 manually and I see that > > the > > > fan speed varies but the min RPM remains 1054. Info below. > > > > > What happens if you write 0 into pwmX ? Also, did you select manual fan > > speed > > control ? > > > > > Writing 0 to pwm2 also keeps it at 1054 RPM. I'm setting pwm2_enable to 1, > isn't that supposed to make it manual? Also, I do see a variation between > 1054 RM and 2109 RPM (and some steps in between), when I change pwm2. I > can't get it to spin lower than 1054 RPM though. > Maybe that is the lowest fan speed supported by this fan ? Guenter > thanks, > -arun > > > > > so how would be very helpful. > > > > > > thanks, > > > -arun > > > > > > root@sandy:/sys/devices/platform/w83627ehf.656# echo 255 > pwm2 > > > root@sandy:/sys/devices/platform/w83627ehf.656# sensors > > > coretemp-isa-0000 > > > Adapter: ISA adapter > > > Any pointers on whether it is possible to reduce fan speed further, and > > if > > > Physical id 0: +46.0°C (high = +78.0°C, crit = +98.0°C) ALARM (CRIT) > > > Core 0: +46.0°C (high = +78.0°C, crit = +98.0°C) ALARM (CRIT) > > > > > > nct6775-isa-0290 > > > Adapter: ISA adapter > > > Vcore: +0.82 V (min = +0.00 V, max = +1.74 V) > > > in1: +1.12 V (min = +0.00 V, max = +0.00 V) ALARM > > > AVCC: +3.46 V (min = +2.98 V, max = +3.63 V) > > > +3.3V: +3.46 V (min = +2.98 V, max = +3.63 V) > > > in4: +1.06 V (min = +0.00 V, max = +0.00 V) ALARM > > > in5: +1.05 V (min = +0.00 V, max = +0.00 V) ALARM > > > in6: +1.08 V (min = +0.00 V, max = +0.00 V) ALARM > > > 3VSB: +3.41 V (min = +2.98 V, max = +3.63 V) > > > Vbat: +3.34 V (min = +2.70 V, max = +3.30 V) ALARM > > > fan1: 0 RPM (min = 0 RPM, div = 128) > > > fan2: 2109 RPM (min = 0 RPM, div = 128) ALARM <---- > > > fan3: 0 RPM (min = 0 RPM, div = 128) > > > fan4: 0 RPM (div = 128) > > > SYSTIN: +31.0°C (high = +0.0°C, hyst = +0.0°C) ALARM sensor > > > = CPU diode > > > CPUTIN: +29.5°C (high = +80.0°C, hyst = +75.0°C) sensor = CPU > > > diode > > > AUXTIN: +22.0°C (high = +80.0°C, hyst = +75.0°C) sensor = > > > thermistor > > > PECI Agent 0: +45.5°C > > > cpu0_vid: +2.050 V > > > intrusion0: OK > > > > > > root@sandy:/sys/devices/platform/w83627ehf.656# echo 1 > pwm2 > > > root@sandy:/sys/devices/platform/w83627ehf.656# sensors > > > coretemp-isa-0000 > > > Adapter: ISA adapter > > > Physical id 0: +46.0°C (high = +78.0°C, crit = +98.0°C) ALARM (CRIT) > > > Core 0: +46.0°C (high = +78.0°C, crit = +98.0°C) ALARM (CRIT) > > > > > > nct6775-isa-0290 > > > Adapter: ISA adapter > > > Vcore: +0.85 V (min = +0.00 V, max = +1.74 V) > > > in1: +1.12 V (min = +0.00 V, max = +0.00 V) ALARM > > > AVCC: +3.46 V (min = +2.98 V, max = +3.63 V) > > > +3.3V: +3.46 V (min = +2.98 V, max = +3.63 V) > > > in4: +1.06 V (min = +0.00 V, max = +0.00 V) ALARM > > > in5: +1.05 V (min = +0.00 V, max = +0.00 V) ALARM > > > in6: +1.08 V (min = +0.00 V, max = +0.00 V) ALARM > > > 3VSB: +3.41 V (min = +2.98 V, max = +3.63 V) > > > Vbat: +3.34 V (min = +2.70 V, max = +3.30 V) ALARM > > > fan1: 0 RPM (min = 0 RPM, div = 128) > > > fan2: 1054 RPM (min = 0 RPM, div = 128) ALARM > > > fan3: 0 RPM (min = 0 RPM, div = 128) > > > fan4: 0 RPM (div = 128) > > > SYSTIN: +30.0°C (high = +0.0°C, hyst = +0.0°C) ALARM sensor > > > = CPU diode > > > CPUTIN: +29.5°C (high = +80.0°C, hyst = +75.0°C) sensor = CPU > > > diode > > > AUXTIN: +22.0°C (high = +80.0°C, hyst = +75.0°C) sensor = > > > thermistor > > > PECI Agent 0: +44.5°C > > > cpu0_vid: +2.050 V > > > intrusion0: OK > > > > > _______________________________________________ > > > lm-sensors mailing list > > > lm-sensors@xxxxxxxxxxxxxx > > > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors > > > > _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
