My patch to fix this issue was pulled into Ubuntu 15.04 with the kernel update 3.19.0-26.27:
https://launchpad.net/ubuntu/+source/linux/3.19.0-26.27 usb: core: Fix USB 3.0 devices lost in NOTATTACHED state after a hub port reset I can confirm that the updated kernel fixes the problem on my machine. ** Changed in: linux (Ubuntu) Status: Triaged => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1455376 Title: REGRESSION after upgrade from 14.10 to 15.04: USB3 boot device lost during system boot: "xhci_hcd 0000:04:00.0: Error while assigning device slot ID" / "device not accepting address 2, error -22" To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1455376/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
