Comment by zombot

It's even worse. The same USB-A-to-USB-C cable will either charge or not charge my iPhone, depending on where I plug in the USB-A part. But the port that won't charge my phone will happily charge my headset, using the very same cable. That kind of excludes the cable as the source of the suckage, and puts the blame on either the (supposed) power source or the phone. I've observed the same effect with other devices I wanted to charge, too. Some devices just won't accept certain USB power sources while others are more promiscuous.