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--- products:sbc:common:add-ons:cooling-fan [2023/03/21 02:36]
nick
+++ products:sbc:common:add-ons:cooling-fan [2026/02/02 01:44] (current)
gray update by using AI
@@ Line 3: / Line 3: @@
 ===== Introduction =====
-This page mainly introduces [[https://www.khadas.com/product-page/3705-cooling-fan | Cooling Fan]]. The first half describes how to control the Cooling Fan on Ubuntu, and the second half describes how to control the Cooling Fan on Android.
+This page introduces the [[https://www.khadas.com/product-page/3705-cooling-fan | Cooling Fan]]. The first section describes how to control the fan on Ubuntu, and the second section describes how to control it on Android.
 ===== Ubuntu =====
+<WRAP important>
+This setting is only applicable to 4.9, 5.15, 5.4, and 6.1 linux kernel
+</WRAP>
 ==== Fan Application ====
-The following method is recommended if you are using desktop OS. Find ''Fan Setting'' from the applications list. Open the app to control the cooling fan speed.
+This method is recommended if you are using a desktop OS. Find ''Fan Setting'' in the applications list. Open the app to control the cooling fan speed.
 {{/products/sbc/common/accessories/gnome_application_fan.png|gnome_application_fan}}
@@ Line 16: / Line 20: @@
 ==== Command Line ====
-You can also use command to control the FAN from terminal.
+You can also use commands to control the fan from the terminal.
 === Set the fan mode ===
-```shell
+^ fan mode ^ command ^
-fan.sh off
+| off | ''fan.sh off'' |
-fan.sh on
+| on | ''fan.sh on'' |
-fan.sh auto
+| auto | ''fan.sh auto'' |
-```
 === Get the fan mode ===
@@ Line 34: / Line 37: @@
 === Set the fan speed ===
-```shell
+^ fan speed ^ command ^
-fan.sh high
+| high | ''fan.sh high'' |
-fan.sh mid
+| mid | ''fan.sh mid'' |
-fan.sh low
+| low | ''fan.sh low'' |
-```
 === Get CPU temperature ===
@@ Line 46: / Line 48: @@
 ```
-=== Get the trigger temperature ===
+=== Get and Set the trigger temperature ===
-You can get the trigger temperature from the nodes below:
+You can read the trigger temperature from the following nodes:
-  * low - /sys/class/fan/trigger_temp_low
+^ fan mode ^ trigger temp parameter ^
-  * mid - /sys/class/fan/trigger_temp_mid
+| low | ''/sys/class/fan/trigger_temp_low'' |
-  * high - /sys/class/fan/trigger_temp_high
+| mid | ''/sys/class/fan/trigger_temp_mid'' |
+| high | ''/sys/class/fan/trigger_temp_high'' |
-e.g. Get the low trigger temperature:
+Example: Get the low trigger temperature:
 ```shell
@@ Line 60: / Line 63: @@
 ```
-=== Set the trigger temperature ===
+Example: Set the low trigger temperature to ''40'' Celsius.
-You can setup the trigger temperature from the nodes below:
-  * low - /sys/class/fan/trigger_temp_low
-  * mid - /sys/class/fan/trigger_temp_mid
-  * high - /sys/class/fan/trigger_temp_high
-e.g. Set the low trigger temperature to ''40'' Celsius.
 ```shell
@@ Line 75: / Line 70: @@
 <WRAP tip >
-The trigger temperature only effect the fan works in auto mode.
+The trigger temperature only affects the fan when it is in auto mode.
 </WRAP>
+=== Mainline linux ===
+The fan is controlled automatically by the Linux thermal subsystem. Temperatures are in millidegrees Celsius.
+Example: Get the auto trigger temperature:
+```
+cat /sys/class/thermal/thermal_zone0/trip_point_3_temp
+```
+Example: set the auto trigger temp to 40000 millicelcius
+```
+echo 40000 | sudo tee /sys/class/thermal/thermal_zone0/trip_point_3_temp
+```
+<WRAP tip >
+To turn the fan off, set the trigger temperature to a higher value (e.g., 80000). \\
+To turn the fan on, set the trigger temperature to a lower value (e.g., 10000).
+</WRAP>
 ===== Android =====
-Just goto the system setting to control the FAN.
+Check system settings to control the fan.

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