On Thu, Jun 28, 2012 at 12:23:04AM -0400, Arun Raghavan wrote: > Fan or winbond ? How can I confirm? > Please don't top-post. Fan. I have a system with NCT6775F as well. It shows 649rpm and 1028rpm right now, with pwm values of 36 and 64. Can you provide the output of all pwm sysfs attributes ? Something like "grep . /sys/class/hwmon/hwmonX/device/pwm*" should do it, where X is the hwmon index for the NCT6775F driver (probably 1 for your system). Thanks, Guenter > On Jun 27, 2012, at 11:53 PM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote: > > > 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
