====== Ubiquiti - Dream Router - Fan Speed ======

===== Check Fan Speed =====

<code bash>
sensors
</code>

returns:

<code bash>
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)
</code>

----                       

===== Change Fan Speed =====

SSH in.

<code bash>
cd /sys/class/hwmon/hwmon0
echo 70 > pwm1
</code>

<WRAP info>
**NOTE:**  This controls a PWM fan – the industry standard – with software. 

  * But it may reset on its own after an hour or so.
</WRAP>

----

===== Check Fan Speed Configuration =====

<code bash>
cat /sys/class/hwmon/hwmon0/pwm1_enable
</code>

returns

<code bash>
1
</code>


<WRAP info>
**NOTE:**  According to the [[https://www.kernel.org/doc/Documentation/hwmon/sysfs-interface|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: <code bash>echo 2 > /sys/class/hwmon/hwmon0/pwm1_enable</code>

  * Check the contents of **sys/class/hwmon/hwmon0/pwm1_auto_point_*** to see a list of temperature settings.
</WRAP>