[lm-sensors] Reducing fan speed for w83627ehf

Guenter Roeck linux at roeck-us.net
Thu Jun 28 05:53:38 CEST 2012


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 at sandy:/sys/devices/platform/w83627ehf.656# echo 255 > pwm2
> > > root at 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 at sandy:/sys/devices/platform/w83627ehf.656# echo 1 > pwm2
> > > root at 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 at lm-sensors.org
> > > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
> >
> >




More information about the lm-sensors mailing list