Imperf3kt wrote: ↑
Mon Nov 11, 2019 4:39 am
... the Pi was never intended to communicate with "Smart" chargers, but rather be powered via a 5v usb power supply.
... except the Pi WAS intended to work with a smart charger, the resistors should instruct the charger to deliver 5V. But there is a circuit error, so they don't work as intended.
The fact that you can use an appropriate usb charger to power your Pi, is a mere bonus, not its intended design.
You are conflating two issues. Some chargers will not maintain 5V while supplying their rated load. That is nothing to do with the smart charger issue. You should be able to power the Pi4B from any 5V source that can provide 3A at 4.75V-5.25V. That includes (some) smart chargers. So there is a design fault on the first release of the Pi4B, it has been agreed as a fault by RPT, it will (at some time) be fixed, probably with other minor board changes (markings for Japanese regulatory approval, possibly). Then the Pi4B will conform to the USB3 PD spec (as a consumer, not sure about as a source).