From mboxrd@z Thu Jan 1 00:00:00 1970 From: Guenter Roeck Date: Thu, 28 Jun 2012 03:53:38 +0000 Subject: Re: [lm-sensors] Reducing fan speed for w83627ehf Message-Id: <20120628035338.GA16191@roeck-us.net> List-Id: References: In-Reply-To: MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable To: lm-sensors@vger.kernel.org On Wed, Jun 27, 2012 at 06:18:09PM -0400, Arun Raghavan wrote: > Hi, >=20 > > I need to get fairly fine grain control on my CPU fan speed for some >=20 > > > 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. >=20 Maybe that is the lowest fan speed supported by this fan ? Guenter > thanks, > -arun >=20 >=20 > > > 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, a= nd > > if > > > Physical id 0: +46.0=B0C (high =3D +78.0=B0C, crit =3D +98.0=B0C) = ALARM (CRIT) > > > Core 0: +46.0=B0C (high =3D +78.0=B0C, crit =3D +98.0=B0C) = ALARM (CRIT) > > > > > > nct6775-isa-0290 > > > Adapter: ISA adapter > > > Vcore: +0.82 V (min =3D +0.00 V, max =3D +1.74 V) > > > in1: +1.12 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > AVCC: +3.46 V (min =3D +2.98 V, max =3D +3.63 V) > > > +3.3V: +3.46 V (min =3D +2.98 V, max =3D +3.63 V) > > > in4: +1.06 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > in5: +1.05 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > in6: +1.08 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > 3VSB: +3.41 V (min =3D +2.98 V, max =3D +3.63 V) > > > Vbat: +3.34 V (min =3D +2.70 V, max =3D +3.30 V) ALARM > > > fan1: 0 RPM (min =3D 0 RPM, div =3D 128) > > > fan2: 2109 RPM (min =3D 0 RPM, div =3D 128) ALARM <---- > > > fan3: 0 RPM (min =3D 0 RPM, div =3D 128) > > > fan4: 0 RPM (div =3D 128) > > > SYSTIN: +31.0=B0C (high =3D +0.0=B0C, hyst =3D +0.0=B0C) A= LARM sensor > > > =3D CPU diode > > > CPUTIN: +29.5=B0C (high =3D +80.0=B0C, hyst =3D +75.0=B0C) s= ensor =3D CPU > > > diode > > > AUXTIN: +22.0=B0C (high =3D +80.0=B0C, hyst =3D +75.0=B0C) s= ensor =3D > > > thermistor > > > PECI Agent 0: +45.5=B0C > > > 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=B0C (high =3D +78.0=B0C, crit =3D +98.0=B0C) = ALARM (CRIT) > > > Core 0: +46.0=B0C (high =3D +78.0=B0C, crit =3D +98.0=B0C) = ALARM (CRIT) > > > > > > nct6775-isa-0290 > > > Adapter: ISA adapter > > > Vcore: +0.85 V (min =3D +0.00 V, max =3D +1.74 V) > > > in1: +1.12 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > AVCC: +3.46 V (min =3D +2.98 V, max =3D +3.63 V) > > > +3.3V: +3.46 V (min =3D +2.98 V, max =3D +3.63 V) > > > in4: +1.06 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > in5: +1.05 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > in6: +1.08 V (min =3D +0.00 V, max =3D +0.00 V) ALARM > > > 3VSB: +3.41 V (min =3D +2.98 V, max =3D +3.63 V) > > > Vbat: +3.34 V (min =3D +2.70 V, max =3D +3.30 V) ALARM > > > fan1: 0 RPM (min =3D 0 RPM, div =3D 128) > > > fan2: 1054 RPM (min =3D 0 RPM, div =3D 128) ALARM > > > fan3: 0 RPM (min =3D 0 RPM, div =3D 128) > > > fan4: 0 RPM (div =3D 128) > > > SYSTIN: +30.0=B0C (high =3D +0.0=B0C, hyst =3D +0.0=B0C) A= LARM sensor > > > =3D CPU diode > > > CPUTIN: +29.5=B0C (high =3D +80.0=B0C, hyst =3D +75.0=B0C) s= ensor =3D CPU > > > diode > > > AUXTIN: +22.0=B0C (high =3D +80.0=B0C, hyst =3D +75.0=B0C) s= ensor =3D > > > thermistor > > > PECI Agent 0: +44.5=B0C > > > 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