The link you send describe random issue about usb 2.0. I can't say if it
will help you or not. You need to test it your self. Try this

sudo modprobe -r ehci_hcd
this will disable your usb 2.0

and after this, attach your new dmesg
you already how to make dmesg ;)

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Feisty can't access USB ports
https://bugs.launchpad.net/bugs/112357
You received this bug notification because you are a member of Ubuntu
Bugs, which is the bug contact for Ubuntu.

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