chargingipadusb
I just read through Fast Charging iPad Pro 12.9 and am intrigued.
However I'd like to use the USB 3 port on my MacBook air instead of buying a new power brick just for the iPad Pro.
Has anybody tried to use an USB 3 -> USB C adaptor in conjunction with Apples USB C to Lightning cable?
I haven't found an USB 3 to USB C adaptor only USB C to USB 3. Maybe that answers my question already.
Go to the Apple on your Menu Bar and select "About this Mac". You will get the System Information app. Select System Report. On the left side, under Hardware, select USB, then find all the available outlets. If they are all similar, you may need some hardware diagnosis. If one is significantly less than the others, that is your answer--it just can't pump out enough juice.
The double chime is definitely a bug rather than a feature. it's caused by the switch from regular charging speed to the fast charging speed. when the power adapter takes too long to make the switch (I guess we're talking about 10s or 100s of milliseconds), the iphone thinks it got disconnected and reconnected again.
That explains why some chargers cause iphones to make a double chime and some don't. Mine is a 3rd party charger and I've never had a double chime on my iphone 11, even though I'm 100% sure it's double charging (I connected it through a wattage meter and I can clearly see that the switch from 5W to 18W happens)
edit: you can refer to this video (not mine, but underlines what I just wrote)
Best Answer
I guess that's the answer. Wikipedia:
Adapters and cables with a Type-C receptacle are not allowed.(41)