Lian Li HydroshiftLCD Fan Control

This software runs as a systemd service written in Python. This is a work in progress.

Dependencies

pip install hidapi
pip install psutil

Setup

We work directly with the HID USB interface. To list the HID Interfaces use the following script. The product vendor and product id should be 0x416 and 0x7399. If not note the ones that correspond with the HydroshiftLCD

import hid

# Enumerate all devices and print relevant info
devices = hid.enumerate()
for device in devices:
    print(f"Vendor: {hex(device['vendor_id'])}, Product: {hex(device['product_id'])}, Path: {device['path']}, Interface: {device.get('interface_number', 'N/A')}, Product: {device['product_string']}")

Next we need to create the appropriate udev rules so our user has access to the system. Create and add your user to the plugdev group if necessary. You may have to change the vendor and product ids.

sudo vim /etc/udev/rules.d/99-hydroshift.rules

Add This line

SUBSYSTEM=="hidraw", ATTRS{idVendor}=="0416", ATTRS{idProduct}=="7399", MODE="0666", GROUP="plugdev"

Reload the udev rules

sudo udevadm control --reload-rules
sudo udevadm trigger

Copy the python script to the following location and alter its permissions.

sudo cp hydroshift_fan_control.py /usr/local/bin/hydroshift_fan_control.py
sudo chmod +x /usr/local/bin/hydroshift_fan_control.py

Create the systemd service.

sudo nano /etc/systemd/system/hydroshift_fan.service

And place the following code

[Unit]
Description=HydroShift AIO Fan Control Service
After=network.target

[Service]
ExecStart=/usr/bin/python /usr/local/bin/hydroshift_fan_control.py
Restart=always
User=root
WorkingDirectory=/usr/local/bin
StandardOutput=syslog
StandardError=syslog

[Install]
WantedBy=multi-user.target

Enable and start the service.

sudo systemctl daemon-reload
sudo systemctl enable hydroshift_fan.service
sudo systemctl start hydroshift_fan.service

Verify it started.

systemctl status hydroshift_fan.service

You can test with stress-ng with the following command.

stress-ng --cpu 0 --cpu-method matrixprod --timeout 120s