> 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.What happens if you write 0 into pwmX ? Also, did you select manual fan speed
> 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.
>
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.
thanks,
-arun
> so how would be very helpful.> Any pointers on whether it is possible to reduce fan speed further, and if
>
> 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
> 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)
>> SYSTIN: +31.0°C (high = +0.0°C, hyst = +0.0°C) ALARM sensor
> 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)
> = 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> Physical id 0: +46.0°C (high = +78.0°C, crit = +98.0°C) ALARM (CRIT)
> 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
> Core 0: +46.0°C (high = +78.0°C, crit = +98.0°C) ALARM (CRIT)
>> SYSTIN: +30.0°C (high = +0.0°C, hyst = +0.0°C) ALARM sensor
> 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)
> = 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
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