HI, Could anybody help me with this, or point me to somewhere? Thanks! Thanks. Yongkui On 10/30/06, Yongkui Han <hanyongkui99 at gmail.com> wrote: > > Hi All, > > I just found the following information on page 43 of the motherboard > manual. > ftp://download.intel.com/design/motherbd/mv/A6514501.pdf > > -------------------------- > 1.14.2.2 Fan Connectors > The D850MD and D850MV boards have two fan connectors with thermal control > signals (fan 1 > and fan 2) that are used to switch the fans on and off as determined by > the thermal sensors. > The ambient temperature of a D850MD- or D850MV-based system is thermally > monitored by > separate temperature sensors that control voltage to the fan 1 and fan 2 > connectors. If the fans > attached to these connectors provide a tachometer signal, the sensor > reports the fan speed to the hardware monitor component. > The temperature sensors that control the fans are initialized by the BIOS > at power-up to turn on only when the sensor reaches 36 oC (96.8 oF). The > fans switch off when their respective sensors cool down to 31 oC (87.8oF). This prevents the fans from turning off and on when the ambient air > around the sensor fluctuates around 35?36 oC. When the fans switch on, they > may appear to rotate slowly because the fan's duty cycle starts at 70 > percent and rises to 100 percent when the sensor reaches 46 oC ( 114.8oF). > Table 12 summarizes the functions of the four fan connectors. > Table 12. Fan Connector Descriptions > > Feature Processor Fan Fan 1 > Fan 2 Fan 3 > +12 V DC connection Yes Yes > Yes Yes > Tachometer output Yes > No Yes No > Controllable No > Yes Yes Yes > ---------------------------- > > In the Table 12, It says the Processor Fan is not controllable, although > the other fans are controllable. > > So this means that I cannot control the CPU fan speed. But it seems that > we could do some tricks to make the system think the thermal sensor is > higher than 46C. Then the CPU fan speed should run at full speed. Then this > is what I want, a fixed CPU fan speed. > > Any suggestions? > > Thanks! > Yongkui > > > > On 10/30/06, Yongkui Han <hanyongkui99 at gmail.com > wrote: > > > > Hi All, > > > > I am trying to control the speed of the CPU fan. I would like to set > > constant CPU fan spee d. > > > > My CPU fan is Intel Fan & Heatsink A65061-001, with 3 wires, green, > > yellow, and black. > > > > I run pwmconfig to see /sys/bus/i2c/devices/9191-0800/pwm1 is controling > > fan1_input, which is the CPU fan, and saved the default configuration into > > /etc/fancontrol file. The pwmconfig command didn't report any errors but I > > noticed that when it reports the CPU fan speed of 0, the CPU fan is actually > > still running. Also, the GNUPLOT graph of the correlation between PWM and > > Fan Speed is very strange. The fan speed are 3233 for all PWM values 2--255, > > and the fan speed is 0 for PWM=0. This is very weird. The pdf file > > pwmtest.pdf is enclosed for your reference. > > > > Then I run fancontrol command. the command is running correctly without > > reporting errors. Now the sensors command will only report a fan speed of 0 > > RPM. But the problem is the CPU fan is still running, it never stops at all. > > > > > > I also tried not to use fancontrol. I use the command: echo 64 > > > /sys/bus/i2c/devices/9191-0800/pwm1, but still this had no effect on the > > CPU fan speed. > > > > Could some one help me with the CPU fan speed control? > > > > Thanks! > > > > BTW, > > I have an Intel D850MV motherboard. There is an ADM1025A sensor chip on > > the motherboard. Also there is an LPC47M142-NC Super I/O chip on the > > motherboard. My CPU is a Pentium 4 CPU, 1.7GHz. > > > > The following is a sample output for my lm-sensors software. > > --------------------------------- > > $ sensors > > adm1025-i2c-0-2d > > Adapter: SMBus I801 adapter at efa0 > > > > +2.5V: +2.49 V (min = +2.25 V, max = +2.75 V) > > VCore: +1.68 V (min = +1.66 V, max = +1.84 V) > > +3.3V: +3.30 V (min = +2.97 V, max = +3.63 V) > > +5V: +5.13 V (min = +4.50 V, max = +5.50 V) > > VCC: +3.30 V (min = +2.97 V, max = +3.63 V) > > CPU Temp: +35.0?C (low = +10?C, high = +60?C) > > M/B Temp: +34.0?C (low = +10?C, high = +45?C) > > vid: +1.750 V (VRM Version 9.0) > > > > smsc47m1-isa-0800 > > Adapter: ISA adapter > > fan1: 3233 RPM (min = 640 RPM, div = 8) > > fan2: 0 RPM (min = 640 RPM, div = 8) > > -------------------------------------------------------------- > > > > > > Regards, > > Yongkui > > > > > > > > > > > > > > > -------------- next part -------------- An HTML attachment was scrubbed... URL: http://lists.lm-sensors.org/pipermail/lm-sensors/attachments/20061103/9875db8a/attachment.html
