Why does the other Type-C port lose power when my Xiaomi Auto roof rail power supply expansion dock is connected to a projector?
Official answer
Please do not worry, this is a normal phenomenon. When you use a Type-C to DC power cable to supply power to a high-power device (such as a projector), to ensure sufficient power supply and to prevent the total output power of both ports simultaneously exceeding the capacity, the Xiaomi Auto roof rail power supply expansion dock will automatically turn off the other Type-C port.