@John, thank you for following up with that suggestion. Client reports a
snappy backup!

I worked up a bit of automation for the processes, as follows:

# fixext_backup.sh

#!/bin/bash -x

cd /sys/bus/pci/drivers/ehci_hcd

USBDRIVE=`/usr/bin/find ./ -name "0000:00:*"`
echo $USBDRIVE

echo $USBDRIVE | /bin/sed "s/\.\///">unbind
echo $USBDRIVE | /bin/sed "s/\.\///">bind

/usr/sbin/lsusb
/bin/sleep 5
/usr/sbin/lsusb


The first lsusb indeed does not find the drive, the second one after
waiting five seconds does, and the client may carry on with their backup
procedure at that point.

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https://bugs.launchpad.net/bugs/645211

Title:
  USB HDD and Flash Drives no longer recognized

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