Hi James,
  Your strace is interesting, the very bottom of it is :

open("/dev/bus/usb/002/002", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/002", O_RDONLY)  = -1 ENODEV (No such device)
open("/dev/bus/usb/002/001", O_RDWR)    = -1 EACCES (Permission denied)
open("/dev/bus/usb/002/001", O_RDONLY)  = 4
ioctl(4, USBDEVFS_CONNECTINFO, 0x7ffff00b5610) = -1 EPERM (Operation not 
permitted)
read(4, 

So, it doesn't like something about /dev/bus/usb/002/001 - but we don't
know what that is.

So, can you repeat the strace, then look at the bottom few lines for the last 
name past to open( - if it's /dev/bus/usb/002/001 again
can you then include the output from:

udevadm info --query=all --name=/dev/bus/usb/002/001

which should hopefully tell us what it is and which driver it is using.

Dave

-- 
lsusb hangs forever
https://bugs.launchpad.net/bugs/570049
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