PinePhone Thermal Tweaks

This page explains how to read the thermal sensor data, and how to read and change the default settings.

Under Linux

The thermal management is handled by the Thermal Sysfs driver under Linux. Depending on the used OS by the user, the default settings might differ from the showcased examples. In case of higher values it can be advised to lower the settings to prevent the phone components from being damaged by excessive heat.

The current CPU temperature can be displayed by typing:

cat /sys/class/thermal/thermal_zone0/temp

To retrieve the thermal zone types and trip points type:

grep . /sys/class/thermal/thermal_zone0/trip_point_*_temp
grep . /sys/class/thermal/thermal_zone0/trip_point_*_type

The values of the trip point temperatures can be lowered individually (make sure the trip points have the correct number for their corresponding trip type, don't swap the values for "critical" and "passive", danger!), example values:

Warning: Setting wrong values in the Thermal Sysfs driver poses a risk, the instructions are directed towards expert-level users and developers!

echo 55000 > /sys/class/thermal/thermal_zone0/trip_point_0_temp
echo 80000 > /sys/class/thermal/thermal_zone0/trip_point_1_temp
echo 90000 > /sys/class/thermal/thermal_zone0/trip_point_2_temp

Further information can be found in these documents from the Linux kenel source:

• Documentation/thermal/sysfs-api.txt
• Documentation/hwmon/sysfs-interface
• Documentation/devicetree/bindings/thermal/thermal.txt