Same problem on 12.04 upgraded from 11.10. Under 11.10 USB 3.0 ports worked fine (although slower then expected - approximately USB2.0 speed) after upgrading I've got the same error.
USB controller: NEC Corporation uPD720200 Jun 18 18:29:42 hat-uo kernel: [11242.726614] xhci_hcd 0000:03:00.0: Timeout while waiting for a slot Jun 18 18:29:42 hat-uo kernel: [11242.726621] hub 4-0:1.0: couldn't allocate port 1 usb_device -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/775543 Title: xhci_hcd: Timeout while waiting for a slot - Issue with USB3 hard disk on 11.04 x86_64 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/775543/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
