Hello all, Here's a report on how I managed to control the CPU fan on a motherboard with the IT8620E chip, as suggested by the lm-sensors wiki: `you can try loading the it87 driver with force_id=0x8728 and see how it goes. If you do, please report, including the output of "sensors"`. First, a quick word on the hardware used. The motherboard is a Gigabyte GA-B85M-DS3H (http://www.gigabyte.com/products/product-page.aspx?pid=4731) and the CPU cooler is an Arctic Cooling Alpine 11 Plus (http://www.arctic.ac/eu_en/alpine-11-plus.html) According to the cooler's technical data, the fan can run at speeds between 500 - 2,000 RPM. However, the BIOS/EFI/UEFI (whatever the proper name is nowadays) would not let me set the PWM value to less than 70, which produces a fan speed of about 1300 RPM (too noisy for my taste). So below is a description of what I did to bring the fan to minimum speed. This was done strictly by trial and error; I do not claim this is the only (or the best) method, it just works for me. sensors-detect reported "Found unknown chip with ID 0x8620". I inserted the it87 module as directed by the wiki page: modprobe it87 force_id=0x8728 After this I tried pwmconfig, but it didn't succeed in controlling the fan (it brought it up to full speed and left it in that state). So then I tried a manual approach. Inserting the module creates a directory inside /sys, such as /sys/devices/platform/it87.2608/: sysdir=$(find /sys/ -name it87.\* -type d) Controlling the fans is possible by modifying various files (mainly pwm1) inside that directory. The first step is to modify the value inside pwm1_enable from 2 to 1. This is needed because if pwm1_enable is left at its initial value (2), pwm1 cannot be changed (attempting to do that produces a "Device or resource busy" error). echo 1 > $sysdir/pwm1_enable Next the desired pwm value can be written into $sysdir/pwm1. Anything from 0-8 puts the fan at full speed, and 9 puts it to around 1600 RPM. Values from 10-255 seem to act as actual pwm values. Initial value was 70 (the value set in BIOS). echo 10 > $sysdir/pwm1 This set the fan speed to around 600 RPM, which was a lot better but still above minimum. It turned out that the speed can be reduced further by changing the value in the pwm1_freq file from the initial 46875 to a value less than 35157: echo 35000 >$sysdir/pwm1_freq After this, the fan speed was reduced to about 470 RPM. Every time the system wakes up from sleep, all 3 files (pwm1_enable, pwm1, pwm1_freq) get restored to their initial values, so they need to be re-written. In the absence of fancontrol functionality, I wrote a small script that presumably emulates fancontrol behaviour - it monitors the temperature output of "sensors" and sets the pwm1 value accordingly. Hope this helps. Regards, Dan. $ sensors acpitz-virtual-0 Adapter: Virtual device temp1: +27.8°C (crit = +105.0°C) temp2: +29.8°C (crit = +105.0°C) coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +40.0°C (high = +80.0°C, crit = +100.0°C) Core 0: +37.0°C (high = +80.0°C, crit = +100.0°C) Core 1: +39.0°C (high = +80.0°C, crit = +100.0°C) it8728-isa-0a30 Adapter: ISA adapter in0: +0.04 V (min = +0.00 V, max = +3.06 V) in1: +2.02 V (min = +0.00 V, max = +3.06 V) in2: +2.00 V (min = +0.00 V, max = +3.06 V) in3: +2.03 V (min = +0.00 V, max = +3.06 V) in4: +0.01 V (min = +0.00 V, max = +3.06 V) in5: +1.73 V (min = +0.00 V, max = +3.06 V) in6: +1.54 V (min = +0.00 V, max = +3.06 V) 3VSB: +3.36 V (min = +0.00 V, max = +6.12 V) Vbat: +2.95 V fan1: 469 RPM (min = 0 RPM) fan2: 0 RPM (min = 0 RPM) fan3: 0 RPM (min = 0 RPM) fan4: 0 RPM (min = 0 RPM) fan5: 0 RPM (min = 0 RPM) temp1: +37.0°C (low = +127.0°C, high = +127.0°C) sensor = thermistor temp2: -128.0°C (low = +127.0°C, high = +127.0°C) sensor = disabled temp3: +31.0°C (low = +127.0°C, high = +127.0°C) sensor = Intel PECI intrusion0: ALARM _______________________________________________ lm-sensors mailing list lm-sensors@xxxxxxxxxxxxxx http://lists.lm-sensors.org/mailman/listinfo/lm-sensors
