![]() Maybe this is as simple as putting a shell-script to on_boot.d like did show before! So my hope is to find a way of pulling `pwm_auto_point1_pwm' down from 128 to something more reasonable for the HDD fan (30 to 50 seems to be nice enough to my ears). With disk: PWM is set to 50%, and set to 50% -> but can be manipulated (via the OLED touchscreen) to lower values than 50%!) No disk: PWM is set to completely off -> and set to a minimum speed, maybe via the Enhanced Acoustics Register With disk: PWM is set to 50%, and set to 50% No disk: PWM is set to completely off -> and set to 0 ![]() (with the speed going from stopped / 0 revs to annoying 4600 revs) (with the speed going from 680 revs to annoying 2800 revs) I found a discussion around this topic, but I don't find a *_stall_disable on my system, so this may be a dead end.įor my UDM pro without HDD installed, the sysfs values are: This may be the culprit for not stopping the HDD fan at all, when a drive is installed. Keep the fans running at the PWM minimum duty cycle, if the temperature should fall below T MIN. īits of Enhanced Acoustics Register 1 (0圆2), when set, In some cases, primarily for psycho-acoustic reasons, it is desirable that the fan never switch off below T MIN. At least there is a function addressing bit 5 to keep the HDD fan spinning. I'm eying on the "Enhanced Acoustics Register", which is linked in the module source code to the pwm1_stall_disable sysfs attribute. Ideally without toasting something, so the fans spooling up when required would be nice. So maybe there is a way to steer the initial parameters? In my case - contrary to what aspires to achieve - I want this thing to just shut up and be as silent as possible. Independently of CPU intervention once initial parameters are set up. The ADT7475 can automatically control the speed of fans based upon the measured temperature. To set the transition time set the value in ms in the temp_smoothing sysfs attribute. This allows smoothing of the fan speed transition. The responsiveness of the ADT747x to temperature changes can be configured. A value of 1 means the fans will run at auto_point1_pwm. A value of 0 means the fans will shut off. ![]() This behaviour can be configured using the pwm_stall_disable sysfs attribute. PWM values range from 0 (off) to 255 (full speed).įan speed may be set to maximum when the temperature sensor associated with the PWM control exceeds temp#_max.Īt Tmin - hysteresis the PWM output can either be off (0% duty cycle) or at the minimum (i.e. As a result, the ADT747x may compute more than one PWM value for a channel at a given time, in which case the maximum value (fastest fan speed) is applied. Temperature boundaries are associated to temperature channels rather than PWM outputs, and a given PWM output can be controlled by several temperature channels. The ADT747x will scale the PWM linearly between the lower and higher PWM speed when the temperature is between the two temperature boundaries. Point2: Set the PWM speed at the higher temperature bound Point1: Set the PWM speed at the lower temperature bound The driver exposes two trip points per PWM channel. adt7475 4-002e: Optional features: fan4 pwm2Įxcerpt on the fan speed control: (bold markup done by me) Welcome to UniFi Dream Machine ! # dmesg | grep adt7475 Make the boot script executable chmod +x /mnt/data/on_boot.d/11-set-fan-speed.sh.Make a file with VI called "11-set-fan-speed.sh" in /mnt/data/on_boot.d/.I've made a simple script which surives a reboot: Making this survive a reboot does indeed need the on-boot-script. The disk fan minimum start offset is "35" and is ~800 rpm (if you would like to keep it running for airflow).Įcho 77 >/sys/class/hwmon/hwmon0/device/pwm2Įcho 35 >/sys/class/hwmon/hwmon0/device/pwm1 The CPU fan minimum start offset is "77" and is ~800 rpm. It wil obviously show 0 rpm when stopped. v /etc/os-release:/host/etc/os-release:ro \ Podman run -privileged -d -name=netdata -restart always \
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