Attaching a log including several full cycles of plugging in, removing,
and plugging back in.  Surprisingly, for the first time since I started
having this difficulty, I was able to go through the cycle more than one
before the failure occurred.  The attached log represents these events:

  20084 - plugged the monitor's USB cable in to a USB port on the
motherboard.  A usb mass storage device was plugged into the monitor at
the time.

  20426 - unplugged the usb mass storage device

  20430 - plugged the usb mass storage device back in

  20439 - unplugged the usb mass storage device (apparently a little too
soon, as some usb mass storage specific errors follow this event in the
log file)

  20444 - plugged the device back in

  20484 - unplugged the device

A few seconds after unplugging the device at 20484 I plugged it in
again, but no new lines appeared in dmesg output for that event.
Several further plug/unplug cycles also added no further lines.


** Attachment added: "plug-unplug-cycle.txt"
   http://launchpadlibrarian.net/23014781/plug-unplug-cycle.txt

-- 
usb hub disappears after one use
https://bugs.launchpad.net/bugs/332643
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