If you're still having trouble...
Looks like there are 2 things to try.....
1. Working without ACPI
Q: would disabling acpi as kernel parameter suffice?
2. Disabling usb autosuspend.
(See my last post for the method)
Q: What info do the developers to start repeating this bug, and fix it?
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ehci_hcd module causes I/O errors in USB 2.0 devices
https://bugs.launchpad.net/bugs/88746
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ubuntu-bugs mailing list
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