Comment # 2 on bug 1210503 from Michael Pujos

I found the issue.

The Kernel is fine and the cause is the user in an extreme case of PEBCAK :/.

I have a long USB extension cable conntected to my laptop and to which I
connect a small USB-A to USB-C cable, to which I connect my Android device for
development.
Believe it or not but I had plug that USB-A to USB-C cable wrong (that is the
terminal USB-C end connected to the USB-A). It resulted in the Kernel thinking
there is a USB device connected somehow, making suspend fail.