USB Accessories Disabled

MTShipp

macrumors 6502a
Original poster
Mar 25, 2009
690
81
Raleigh, North Carolina
Anyone testing iOS 11 B1 or B2 experience that when they connect their device to a Mac using Sierra 10.12.5 they get a message in OS X that, "USB Accessories Disabled: Unplug the accessory using too much power to re-enable USB devices"?

This happened in B1 and now in B2. If I revert the iPad back to 10.3.2 the messages never appear.

I did submit this as a bug report. Wonder if others have it.

This is with my iPad 12.9 second gen on my MBPro 2016 w/ TB connected via USB-C to Lightning.
 

4268256

Suspended
Jun 23, 2017
37
11
My iPhone is no longer detected by iTunes on my Mac, I'm on iOS 11 Beta 2 and macOS High Sierra. There's no message about power at all for me. Not sure if this is the same problem as yours though, as my MacBook is a USB-A MacBook.
The difference with USB-C is that USB-C allows power transfer both ways, so there's a chance your iPad is trying to charge your MacBook or trying to charge with your MacBook.
 
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wanderlust19283

macrumors newbie
Oct 27, 2017
22
11
Chicago, IL
I'm still having this issue with the 2016 touchbar macbook pro 13" and plugging in a 10.5" ipad pro. It's inconsistent, but will be resolved by me unplugging the ipad pro and then plugging it back in. I'm using apple's usb-c to thunderbolt cable as well.

Anyone know of any updates to this, or any solution? Anyone else experiencing this?