My HP Spectre won't charge from non-HP usb-c chargers in Windows; or, at least, it complains and says it won't charge. I haven't tested whether it actually draws current or not since I only booted it once in Windows. However, in Linux it charges fine at full-speed from non-HP charger with appropriate wattage. It will not charge at all from several chargers that don't have the necessary 90W capability.