.. include:: /urls.rst

.. _librem_14_fans:

System Fans
===========

You can monitor the system fans from the virtual ``sys`` filesystem.
These fields are read-only; the fan is controlled by the Librem EC firmware.

.. note::

   This requires the `Librem EC ACPI driver <ec_acpi_dkms_>`_.

Fan status is provided in:

.. code-block::

   /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PURI4543:00/hwmon/hwmon*

For example:

* Get the fan duty cycle:

  .. code-block:: bash

     cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PURI4543:00/hwmon/hwmon*/pwm1

* Get the CPU temperature used to control the fans:

  .. code-block:: bash

     cat /sys/devices/LNXSYSTM:00/LNXSYBUS:00/PURI4543:00/hwmon/hwmon*/temp1_input