contents of /sys/kernel/debug/usb/ehci/0000:00:1d.0/registers before unbinding:
bus pci, device 0000:00:1d.0
EHCI Host Controller
EHCI 1.00, rh state running
ownership 00000001
SMI sts/enable 0xc0080000
structural params 0x00200008
capability params 0x00036881
status 6008 Periodic Recl FLR
command 0010011 (park)=0 ithresh=1 Periodic period=1024 RUN
intrenable 37 IAA FATAL PCD ERR INT
uframe 2cb2
port:1 status 001005 0  ACK POWER sig=se0 PE CONNECT
port:2 status 001000 0  ACK POWER sig=se0
port:3 status 001000 0  ACK POWER sig=se0
port:4 status 001000 0  ACK POWER sig=se0
port:5 status 001000 0  ACK POWER sig=se0
port:6 status 001000 0  ACK POWER sig=se0
port:7 status 001000 0  ACK POWER sig=se0
port:8 status 001000 0  ACK POWER sig=se0
irq normal 17 err 0 iaa 8 (lost 0)
complete 17 unlink 0

There are no /sys/.../power/ files, because CONFIG_PM is disabled.
This kernel does not freeze, so the debug output on unbinding is contained in 
the attached dmesg log.

** Attachment added: "dmesg from a corresponding 4.2 kernel, CONFIG_PM disabled"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1485057/+attachment/4469704/+files/dmesg-g-after-unbind.txt

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https://bugs.launchpad.net/bugs/1485057

Title:
  "lsusb -v" as root freezes the kernel on Acer ES1-111; also freeze on
  shutdown

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