Table of Contents

Ubiquiti - Dream Router - Fan Speed

Check Fan Speed

sensors

returns: 

lm63-i2c-0-4c
Adapter: i2c-mt65xx
fan1:        2166 RPM  (min =    0 RPM)
temp1:        +54.0°C  (high = +70.0°C)
temp2:        +53.2°C  (low  =  +0.0°C, high = +70.0°C)
                       (crit = +125.0°C, hyst = +115.0°C)

Change Fan Speed

SSH in. 

cd /sys/class/hwmon/hwmon0
echo 70 > pwm1

NOTE: This controls a PWM fan – the industry standard – with software.

  • But it may reset on its own after an hour or so.

Check Fan Speed Configuration

cat /sys/class/hwmon/hwmon0/pwm1_enable

returns 

1

NOTE: According to the hwmon docs at kernel.org, this means that the fan is configured for fixed-speed operation.

  • The following should enable automatic fan speed control in theory: 
    echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable
  • Check the contents of sys/class/hwmon/hwmon0/pwm1_auto_point_* to see a list of temperature settings.