This problem can be seen on any machine actually. I was seeing it
earlier. The key is to NOT run "lsusb". This kicks off a fresh scan of
the USB bus and then it's seen.

So to reproduce:

1) Connect USB hub to usb port
2) Connect any device to it .. in this case try a USB stick .. though it's for 
any
* DO NOT RUN "lsusb"
3)  Check dmesg and notice the device is not seen
4) Run "lsusb" and notice now your device is seen.

Appears a problem only with this kernel. As reported it works fine with
8.10. Will try and narrow down the change that may fix this issue.

-- 
Ubuntu 8.04.3 amd64 on Dell PE R610 : Front USB ports do not detect newly 
inserted USB device
https://bugs.launchpad.net/bugs/406419
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