There is nothing to detect on the sink side, for basic operation. All the smarts are in the power source.

It's like saying USB cables should still carry 10Gbps data when only the VBUS and GND wires are present, because some AliExpress scammers leave out the data wires: you can't leave out trivial core parts and still expect it to work!

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mort96 19 hours ago | parent [-]

> There is nothing to detect on the sink side, for basic operation.

I know. You need the detection for the fancy stuff like PD, not for basic operation.

So why does it matter that a resistor is missing on the sink side? It's stupid.

	▲	Ajedi32 17 hours ago \| parent \| next [-]
		It is needed for basic operation, because unlike with a A-to-B cable, power bricks plugged into a USB-C cable have no way of knowing whether the other side is also a power supply that will short out if you try to feed it power instead of drawing power from it. A couple resistors in the sink is probably the cheapest possible way of signaling this information to the supply. This isn't PD, it's just a basic requirement to allow having the same connector on both ends of the cable.
	▲	seba_dos1 19 hours ago \| parent \| prev [-]
		You already got the answer spelled out several times here in this thread.