* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
@ 2012-06-27 19:40 ` Guenter Roeck
2012-06-27 22:18 ` Arun Raghavan
` (10 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Guenter Roeck @ 2012-06-27 19:40 UTC (permalink / raw)
To: lm-sensors
On Wed, Jun 27, 2012 at 02:28:34PM -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 ?
Thanks,
Guenter
> Any pointers on whether it is possible to reduce fan speed further, and if
> 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
> 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@lm-sensors.org
> http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
2012-06-27 19:40 ` Guenter Roeck
@ 2012-06-27 22:18 ` Arun Raghavan
2012-06-28 3:53 ` Guenter Roeck
` (9 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Arun Raghavan @ 2012-06-27 22:18 UTC (permalink / raw)
To: lm-sensors
[-- Attachment #1.1: Type: text/plain, Size: 4257 bytes --]
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.
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@lm-sensors.org
> > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
>
>
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_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
2012-06-27 19:40 ` Guenter Roeck
2012-06-27 22:18 ` Arun Raghavan
@ 2012-06-28 3:53 ` Guenter Roeck
2012-06-28 4:23 ` Arun Raghavan
` (8 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Guenter Roeck @ 2012-06-28 3:53 UTC (permalink / raw)
To: lm-sensors
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@lm-sensors.org
> > > http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
> >
> >
_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (2 preceding siblings ...)
2012-06-28 3:53 ` Guenter Roeck
@ 2012-06-28 4:23 ` Arun Raghavan
2012-06-28 5:26 ` Guenter Roeck
` (7 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Arun Raghavan @ 2012-06-28 4:23 UTC (permalink / raw)
To: lm-sensors
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^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (3 preceding siblings ...)
2012-06-28 4:23 ` Arun Raghavan
@ 2012-06-28 5:26 ` Guenter Roeck
2012-06-28 6:31 ` Jean Delvare
` (6 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Guenter Roeck @ 2012-06-28 5:26 UTC (permalink / raw)
To: lm-sensors
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@roeck-us.net> 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@lm-sensors.org
> >>>> http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
> >>>
> >>>
>
_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (4 preceding siblings ...)
2012-06-28 5:26 ` Guenter Roeck
@ 2012-06-28 6:31 ` Jean Delvare
2012-06-28 16:20 ` Arun Raghavan
` (5 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Jean Delvare @ 2012-06-28 6:31 UTC (permalink / raw)
To: lm-sensors
On Wed, 27 Jun 2012 18:18:09 -0400, Arun Raghavan wrote:
> 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 RPM and 2109 RPM (and some steps in between), when I change pwm2. I
> can't get it to spin lower than 1054 RPM though.
4-wire fans (which are the most popular on CPU cooling blocks these
days) have an indirect interpretation of the PWM value, which means
that the fan maker is free to set the minimum speed (PWM = 0) to any
arbitrary limit they want. In best cases the value is clearly
documented in the product description sheet or accompanying technical
documentation.
1000 RPM is a relatively common value for the minimum speed of CPU
fans, so I'm not surprised by your observations. If this is too much
for you, you have to either lower the input voltage to the fan, or use
a different model altogether.
--
Jean Delvare
_______________________________________________
lm-sensors mailing list
lm-sensors@lm-sensors.org
http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (5 preceding siblings ...)
2012-06-28 6:31 ` Jean Delvare
@ 2012-06-28 16:20 ` Arun Raghavan
2012-06-28 16:21 ` Arun Raghavan
` (4 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Arun Raghavan @ 2012-06-28 16:20 UTC (permalink / raw)
To: lm-sensors
[-- Attachment #1.1: Type: text/plain, Size: 6871 bytes --]
> 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).
>
> /sys/class/hwmon/hwmon1/device/pwm1:255
/sys/class/hwmon/hwmon1/device/pwm1_enable:1
/sys/class/hwmon/hwmon1/device/pwm1_max_output:255
/sys/class/hwmon/hwmon1/device/pwm1_mode:1
/sys/class/hwmon/hwmon1/device/pwm1_start_output:128
/sys/class/hwmon/hwmon1/device/pwm1_step_output:3
/sys/class/hwmon/hwmon1/device/pwm1_stop_output:128
/sys/class/hwmon/hwmon1/device/pwm1_stop_time:1000
/sys/class/hwmon/hwmon1/device/pwm1_target:41000
/sys/class/hwmon/hwmon1/device/pwm1_tolerance:1000
/sys/class/hwmon/hwmon1/device/pwm2:1
/sys/class/hwmon/hwmon1/device/pwm2_enable:1
/sys/class/hwmon/hwmon1/device/pwm2_max_output:255
/sys/class/hwmon/hwmon1/device/pwm2_mode:1
/sys/class/hwmon/hwmon1/device/pwm2_start_output:128
/sys/class/hwmon/hwmon1/device/pwm2_step_output:4
/sys/class/hwmon/hwmon1/device/pwm2_stop_output:128
/sys/class/hwmon/hwmon1/device/pwm2_stop_time:1000
/sys/class/hwmon/hwmon1/device/pwm2_target:44000
/sys/class/hwmon/hwmon1/device/pwm2_tolerance:1000
/sys/class/hwmon/hwmon1/device/pwm3:1
/sys/class/hwmon/hwmon1/device/pwm3_enable:1
/sys/class/hwmon/hwmon1/device/pwm3_max_output:255
/sys/class/hwmon/hwmon1/device/pwm3_mode:1
/sys/class/hwmon/hwmon1/device/pwm3_start_output:128
/sys/class/hwmon/hwmon1/device/pwm3_step_output:3
/sys/class/hwmon/hwmon1/device/pwm3_stop_output:128
/sys/class/hwmon/hwmon1/device/pwm3_stop_time:1000
/sys/class/hwmon/hwmon1/device/pwm3_target:41000
/sys/class/hwmon/hwmon1/device/pwm3_tolerance:1000
thanks,
-arun
> Thanks,
> Guenter
>
> > On Jun 27, 2012, at 11:53 PM, Guenter Roeck <linux@roeck-us.net> 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@lm-sensors.org
> > >>>> http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
> > >>>
> > >>>
> >
>
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^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (6 preceding siblings ...)
2012-06-28 16:20 ` Arun Raghavan
@ 2012-06-28 16:21 ` Arun Raghavan
2012-06-28 16:30 ` Jean Delvare
` (3 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Arun Raghavan @ 2012-06-28 16:21 UTC (permalink / raw)
To: lm-sensors
[-- Attachment #1.1: Type: text/plain, Size: 1211 bytes --]
On Thu, Jun 28, 2012 at 2:31 AM, Jean Delvare <khali@linux-fr.org> wrote:
> On Wed, 27 Jun 2012 18:18:09 -0400, Arun Raghavan wrote:
> > 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 RPM and 2109 RPM (and some steps in between), when I change pwm2. I
> > can't get it to spin lower than 1054 RPM though.
>
> 4-wire fans (which are the most popular on CPU cooling blocks these
> days) have an indirect interpretation of the PWM value, which means
> that the fan maker is free to set the minimum speed (PWM = 0) to any
> arbitrary limit they want. In best cases the value is clearly
> documented in the product description sheet or accompanying technical
> documentation.
>
> 1000 RPM is a relatively common value for the minimum speed of CPU
> fans, so I'm not surprised by your observations. If this is too much
> for you, you have to either lower the input voltage to the fan, or use
> a different model altogether.
>
>
Thanks, that makes sense. Can I control the input voltage through
software/some sysfs attribute or do I have to do it from the supply?
thanks,
-arun
--
> Jean Delvare
>
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^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (7 preceding siblings ...)
2012-06-28 16:21 ` Arun Raghavan
@ 2012-06-28 16:30 ` Jean Delvare
2012-06-28 17:04 ` Guenter Roeck
` (2 subsequent siblings)
11 siblings, 0 replies; 13+ messages in thread
From: Jean Delvare @ 2012-06-28 16:30 UTC (permalink / raw)
To: lm-sensors
On Thu, 28 Jun 2012 12:21:40 -0400, Arun Raghavan wrote:
> On Thu, Jun 28, 2012 at 2:31 AM, Jean Delvare <khali@linux-fr.org> wrote:
> > 1000 RPM is a relatively common value for the minimum speed of CPU
> > fans, so I'm not surprised by your observations. If this is too much
> > for you, you have to either lower the input voltage to the fan, or use
> > a different model altogether.
>
> Thanks, that makes sense. Can I control the input voltage through
> software/some sysfs attribute or do I have to do it from the supply?
You have to hack it physically, typically by adding a serial resistor.
Some vendors ship such adapters with their fans. I got mine from Noctua
but these are 3-pin, not 4-pin ones so it wouldn't help you. Zalman
also has 3-pin model [1] but apparently no 4-pin model :(
[1] http://www.zalman.com/ENG/product/Product_Read.asp?idx"3
If there's a way to reduce the voltage by software, it would be totally
board specific (using a custom DAC device) and not supported.
--
Jean Delvare
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^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (8 preceding siblings ...)
2012-06-28 16:30 ` Jean Delvare
@ 2012-06-28 17:04 ` Guenter Roeck
2012-06-28 17:18 ` Arun Raghavan
2012-06-28 19:06 ` Guenter Roeck
11 siblings, 0 replies; 13+ messages in thread
From: Guenter Roeck @ 2012-06-28 17:04 UTC (permalink / raw)
To: lm-sensors
On Thu, Jun 28, 2012 at 12:20:08PM -0400, Arun Raghavan wrote:
> > 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).
> >
> > /sys/class/hwmon/hwmon1/device/pwm1:255
> /sys/class/hwmon/hwmon1/device/pwm1_enable:1
> /sys/class/hwmon/hwmon1/device/pwm1_max_output:255
> /sys/class/hwmon/hwmon1/device/pwm1_mode:1
> /sys/class/hwmon/hwmon1/device/pwm1_start_output:128
> /sys/class/hwmon/hwmon1/device/pwm1_step_output:3
> /sys/class/hwmon/hwmon1/device/pwm1_stop_output:128
> /sys/class/hwmon/hwmon1/device/pwm1_stop_time:1000
> /sys/class/hwmon/hwmon1/device/pwm1_target:41000
> /sys/class/hwmon/hwmon1/device/pwm1_tolerance:1000
> /sys/class/hwmon/hwmon1/device/pwm2:1
> /sys/class/hwmon/hwmon1/device/pwm2_enable:1
> /sys/class/hwmon/hwmon1/device/pwm2_max_output:255
> /sys/class/hwmon/hwmon1/device/pwm2_mode:1
> /sys/class/hwmon/hwmon1/device/pwm2_start_output:128
> /sys/class/hwmon/hwmon1/device/pwm2_step_output:4
> /sys/class/hwmon/hwmon1/device/pwm2_stop_output:128
> /sys/class/hwmon/hwmon1/device/pwm2_stop_time:1000
> /sys/class/hwmon/hwmon1/device/pwm2_target:44000
> /sys/class/hwmon/hwmon1/device/pwm2_tolerance:1000
> /sys/class/hwmon/hwmon1/device/pwm3:1
> /sys/class/hwmon/hwmon1/device/pwm3_enable:1
> /sys/class/hwmon/hwmon1/device/pwm3_max_output:255
> /sys/class/hwmon/hwmon1/device/pwm3_mode:1
> /sys/class/hwmon/hwmon1/device/pwm3_start_output:128
> /sys/class/hwmon/hwmon1/device/pwm3_step_output:3
> /sys/class/hwmon/hwmon1/device/pwm3_stop_output:128
> /sys/class/hwmon/hwmon1/device/pwm3_stop_time:1000
> /sys/class/hwmon/hwmon1/device/pwm3_target:41000
> /sys/class/hwmon/hwmon1/device/pwm3_tolerance:1000
>
Hi Arun,
is that the default setting after system powerup, or did you modify it ?
Just wondering, since the NCT6775 is usually configured for automatic fan
control (which, in my experience, works pretty well).
Anyway, the fans are all in pwm mode, so I think Jean is right and the fan just
doesn't get slower than 1000 rpm. Which may explain why one of the fans in my
system runs at 1000 rpm, even though it turns out that its pwm value is lower
than the other fan's pwm value.
For comparison, here is the output for pwm1 on my system with NCT6775.
/sys/class/hwmon/hwmon1/device/pwm1:64
/sys/class/hwmon/hwmon1/device/pwm1_auto_point1_pwm:50
/sys/class/hwmon/hwmon1/device/pwm1_auto_point1_temp:5000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point1_temp_hyst:3000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point2_pwm:77
/sys/class/hwmon/hwmon1/device/pwm1_auto_point2_temp:89000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point2_temp_hyst:87000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point3_pwm:77
/sys/class/hwmon/hwmon1/device/pwm1_auto_point3_temp:89000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point3_temp_hyst:87000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point4_pwm:123
/sys/class/hwmon/hwmon1/device/pwm1_auto_point4_temp:98000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point4_temp_hyst:96000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point5_pwm:166
/sys/class/hwmon/hwmon1/device/pwm1_auto_point5_temp:101000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point5_temp_hyst:99000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point6_pwm:255
/sys/class/hwmon/hwmon1/device/pwm1_auto_point6_temp:104000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point6_temp_hyst:102000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point7_pwm:255
/sys/class/hwmon/hwmon1/device/pwm1_auto_point7_temp:114000
/sys/class/hwmon/hwmon1/device/pwm1_auto_point7_temp_hyst:114000
/sys/class/hwmon/hwmon1/device/pwm1_enable:5
/sys/class/hwmon/hwmon1/device/pwm1_max_output:255
/sys/class/hwmon/hwmon1/device/pwm1_mode:1
/sys/class/hwmon/hwmon1/device/pwm1_start_output:1
/sys/class/hwmon/hwmon1/device/pwm1_step_down_time:100
/sys/class/hwmon/hwmon1/device/pwm1_step_enable:1
/sys/class/hwmon/hwmon1/device/pwm1_step_output:1
/sys/class/hwmon/hwmon1/device/pwm1_step_up_time:200
/sys/class/hwmon/hwmon1/device/pwm1_stop_output:1
/sys/class/hwmon/hwmon1/device/pwm1_stop_output_enable:0
/sys/class/hwmon/hwmon1/device/pwm1_stop_time:6000
/sys/class/hwmon/hwmon1/device/pwm1_target:1000
/sys/class/hwmon/hwmon1/device/pwm1_temp_sel:8
/sys/class/hwmon/hwmon1/device/pwm1_weight_duty_step:36
/sys/class/hwmon/hwmon1/device/pwm1_weight_enable:1
/sys/class/hwmon/hwmon1/device/pwm1_weight_temp_sel:1
/sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step:2000
/sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step_base:70000
/sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step_tol:1000
This is with the new driver for the NCT677X chips, which supports automatic
fan control. Might be worthwhile to give it a try if you want to use
automatic fan control.
Thanks,
Guenter
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^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (9 preceding siblings ...)
2012-06-28 17:04 ` Guenter Roeck
@ 2012-06-28 17:18 ` Arun Raghavan
2012-06-28 19:06 ` Guenter Roeck
11 siblings, 0 replies; 13+ messages in thread
From: Arun Raghavan @ 2012-06-28 17:18 UTC (permalink / raw)
To: lm-sensors
[-- Attachment #1.1: Type: text/plain, Size: 4250 bytes --]
Hi Guenter,
> is that the default setting after system powerup, or did you modify it ?
> Just wondering, since the NCT6775 is usually configured for automatic fan
> control (which, in my experience, works pretty well).
>
> Anyway, the fans are all in pwm mode, so I think Jean is right and the fan
> just
> doesn't get slower than 1000 rpm. Which may explain why one of the fans in
> my
> system runs at 1000 rpm, even though it turns out that its pwm value is
> lower
> than the other fan's pwm value.
>
I modified it to manual and changed the PWM divisor to see what speeds I
could get. I agree that Jean's diagnosis makes sense.
It isn't that the automatic fan control didn't work well, in fact it never
gave me problems. This might sound weird, but I actually need the fan speed
lower to reach a specific (lower) TDP for experimental work.
After playing around with the heatsink and fan settings, the TDP is
currently pretty close to what I ideally want, to within about 5W. I was
hoping to shave off 5W more by reducing fan speed further.
>
> For comparison, here is the output for pwm1 on my system with NCT6775.
>
> /sys/class/hwmon/hwmon1/device/pwm1:64
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point1_pwm:50
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point1_temp:5000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point1_temp_hyst:3000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point2_pwm:77
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point2_temp:89000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point2_temp_hyst:87000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point3_pwm:77
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point3_temp:89000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point3_temp_hyst:87000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point4_pwm:123
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point4_temp:98000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point4_temp_hyst:96000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point5_pwm:166
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point5_temp:101000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point5_temp_hyst:99000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point6_pwm:255
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point6_temp:104000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point6_temp_hyst:102000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point7_pwm:255
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point7_temp:114000
> /sys/class/hwmon/hwmon1/device/pwm1_auto_point7_temp_hyst:114000
> /sys/class/hwmon/hwmon1/device/pwm1_enable:5
> /sys/class/hwmon/hwmon1/device/pwm1_max_output:255
> /sys/class/hwmon/hwmon1/device/pwm1_mode:1
> /sys/class/hwmon/hwmon1/device/pwm1_start_output:1
> /sys/class/hwmon/hwmon1/device/pwm1_step_down_time:100
> /sys/class/hwmon/hwmon1/device/pwm1_step_enable:1
> /sys/class/hwmon/hwmon1/device/pwm1_step_output:1
> /sys/class/hwmon/hwmon1/device/pwm1_step_up_time:200
> /sys/class/hwmon/hwmon1/device/pwm1_stop_output:1
> /sys/class/hwmon/hwmon1/device/pwm1_stop_output_enable:0
> /sys/class/hwmon/hwmon1/device/pwm1_stop_time:6000
> /sys/class/hwmon/hwmon1/device/pwm1_target:1000
> /sys/class/hwmon/hwmon1/device/pwm1_temp_sel:8
> /sys/class/hwmon/hwmon1/device/pwm1_weight_duty_step:36
> /sys/class/hwmon/hwmon1/device/pwm1_weight_enable:1
> /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_sel:1
> /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step:2000
> /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step_base:70000
> /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step_tol:1000
>
> This is with the new driver for the NCT677X chips, which supports automatic
> fan control. Might be worthwhile to give it a try if you want to use
> automatic fan control.
>
> Thanks. I'm trying to retain control of the thermals for a study.
Actually, could you provide some more info on how the automatic control
works? In specific, does it try to keep *average* temperature under control
by modulating fan speed, or can I get it to keep a constant fan speed so
that temperature doesn't fluctuate (i.e. a plot of temperature v/s time
would be monotonic under constant input power)? That might work for me too.
Otherwise, as Jean said, I will have to look at replacing the fan and/or
changing input voltage.
thanks,
-arun
> Thanks,
> Guenter
>
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^ permalink raw reply [flat|nested] 13+ messages in thread* Re: [lm-sensors] Reducing fan speed for w83627ehf
2012-06-27 18:28 [lm-sensors] Reducing fan speed for w83627ehf Arun Raghavan
` (10 preceding siblings ...)
2012-06-28 17:18 ` Arun Raghavan
@ 2012-06-28 19:06 ` Guenter Roeck
11 siblings, 0 replies; 13+ messages in thread
From: Guenter Roeck @ 2012-06-28 19:06 UTC (permalink / raw)
To: lm-sensors
On Thu, Jun 28, 2012 at 01:18:45PM -0400, Arun Raghavan wrote:
> Hi Guenter,
>
>
>
> > is that the default setting after system powerup, or did you modify it ?
> > Just wondering, since the NCT6775 is usually configured for automatic fan
> > control (which, in my experience, works pretty well).
> >
> > Anyway, the fans are all in pwm mode, so I think Jean is right and the fan
> > just
> > doesn't get slower than 1000 rpm. Which may explain why one of the fans in
> > my
> > system runs at 1000 rpm, even though it turns out that its pwm value is
> > lower
> > than the other fan's pwm value.
> >
>
> I modified it to manual and changed the PWM divisor to see what speeds I
> could get. I agree that Jean's diagnosis makes sense.
> It isn't that the automatic fan control didn't work well, in fact it never
> gave me problems. This might sound weird, but I actually need the fan speed
> lower to reach a specific (lower) TDP for experimental work.
> After playing around with the heatsink and fan settings, the TDP is
> currently pretty close to what I ideally want, to within about 5W. I was
> hoping to shave off 5W more by reducing fan speed further.
>
> >
> > For comparison, here is the output for pwm1 on my system with NCT6775.
> >
> > /sys/class/hwmon/hwmon1/device/pwm1:64
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point1_pwm:50
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point1_temp:5000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point1_temp_hyst:3000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point2_pwm:77
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point2_temp:89000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point2_temp_hyst:87000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point3_pwm:77
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point3_temp:89000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point3_temp_hyst:87000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point4_pwm:123
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point4_temp:98000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point4_temp_hyst:96000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point5_pwm:166
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point5_temp:101000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point5_temp_hyst:99000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point6_pwm:255
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point6_temp:104000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point6_temp_hyst:102000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point7_pwm:255
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point7_temp:114000
> > /sys/class/hwmon/hwmon1/device/pwm1_auto_point7_temp_hyst:114000
> > /sys/class/hwmon/hwmon1/device/pwm1_enable:5
> > /sys/class/hwmon/hwmon1/device/pwm1_max_output:255
> > /sys/class/hwmon/hwmon1/device/pwm1_mode:1
> > /sys/class/hwmon/hwmon1/device/pwm1_start_output:1
> > /sys/class/hwmon/hwmon1/device/pwm1_step_down_time:100
> > /sys/class/hwmon/hwmon1/device/pwm1_step_enable:1
> > /sys/class/hwmon/hwmon1/device/pwm1_step_output:1
> > /sys/class/hwmon/hwmon1/device/pwm1_step_up_time:200
> > /sys/class/hwmon/hwmon1/device/pwm1_stop_output:1
> > /sys/class/hwmon/hwmon1/device/pwm1_stop_output_enable:0
> > /sys/class/hwmon/hwmon1/device/pwm1_stop_time:6000
> > /sys/class/hwmon/hwmon1/device/pwm1_target:1000
> > /sys/class/hwmon/hwmon1/device/pwm1_temp_sel:8
> > /sys/class/hwmon/hwmon1/device/pwm1_weight_duty_step:36
> > /sys/class/hwmon/hwmon1/device/pwm1_weight_enable:1
> > /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_sel:1
> > /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step:2000
> > /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step_base:70000
> > /sys/class/hwmon/hwmon1/device/pwm1_weight_temp_step_tol:1000
> >
> > This is with the new driver for the NCT677X chips, which supports automatic
> > fan control. Might be worthwhile to give it a try if you want to use
> > automatic fan control.
> >
> > Thanks. I'm trying to retain control of the thermals for a study.
> Actually, could you provide some more info on how the automatic control
> works? In specific, does it try to keep *average* temperature under control
> by modulating fan speed, or can I get it to keep a constant fan speed so
> that temperature doesn't fluctuate (i.e. a plot of temperature v/s time
> would be monotonic under constant input power)? That might work for me too.
The chip has multiple modes. In "thermal cruise" mode it tries to keep a fixed
temperature by adjusting the fan speed. In "speed cruise" mode it tries to keep
the fan speed constant. In "SmartFan" mode it increases the fan speed with
increasing temperature based on the settings in the auto_point attributes.
In SmartFan mode, the auto_point settings can optionally be augmented with
the "weight" attributes. For example, if the board temperature is low but
the CPU temperature is high, the chassis fan can be made to run faster
by monitoring the CPU temperature in addition to the board temperature.
Guenter
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