Please add this to your guide:
Add possibility to use suspend mode when using CoreELEC on USB device
This modification do require advanced user skills by using a solder iron.
The USB 5V are controlled by a step-down converter. This converter do have a enable pin.
By pulling this pin high to Vin it get enabled. By pulling the enable pin low the converter is disabled.
The enable pin is controlled by the device u-boot by pull high/low a GPIO pin.
This GPIO pin will drive a simple Mosfet what will pull down the enable pin of the converter if set.
So when the Mosfet is removed the USB 5V are permanent on.
Homatics is not able to remove the code line in u-boot source what do set/clear this GPIO pin because it’s out of their control.
Location to find the Mosfet (Homatics Dune R4 Plus, PCB 2022.3.25, SMB.280.08D)
Mosfet assembled
Mosfet removed
The left upper pad is hard to get released as it’s the ground pin. So the heat of the solder iron is quickly removed.
Use at your own risk: can void warranty!