Here you have.
As I suppose it's important, I commented it with when I'm doing what.
Also, I thought the USB events during boot might be useful.

Please note :
- the hub is 2.0 but the controller is 1.1
- this is a 7-port hub made of 2 daisy-chained 4-port chips.
(is there a way I can find on which chip a device is connected?)
- but the problem starts occurring equally on all ports.
- dis/reconnecting the controller to hub cable makes the problem no longer 
occur.
- I don't know why it starts occurring.


** Attachment added: "dmesg.txt"
   http://launchpadlibrarian.net/17194976/dmesg.txt

-- 
usb device invisible until lsusb command issued
https://bugs.launchpad.net/bugs/263139
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