I think i'm experiencing the same bug. Motherboard: ASUS P9X79 Deluxe, suddenly usb devices on some ports disappear. This appears from kernel:
kernel: [18170.960026] xhci_hcd 0000:06:00.0: xHCI host not responding to stop endpo kernel: [18170.960033] xhci_hcd 0000:06:00.0: Assuming host is dying, halting host. kernel: [18170.960074] xhci_hcd 0000:06:00.0: HC died; cleaning up kernel: [18170.960139] usb 5-2: USB disconnect, device number 2 kernel: [18170.960146] usb 5-2.3: USB disconnect, device number 3 kernel: [18171.011433] usb 5-2.4: USB disconnect, device number 4 kernel: [18171.011438] usb 5-2.4.3: USB disconnect, device number 5 kernel: [18171.011984] usb 6-2: USB disconnect, device number 2 I think the error state remains across soft reboots such that you have to physically power off, but can't test it right now. It happens with all kinds of devices ranging from usb 1-3, low power (mouse/keyboard), with and without a hub in the port. Since several motherboard ports drop out simultaneously I imagine they are all tied to one usb controller or one internal hub. Very annoying bug, hope this confirmation helps. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1151622 Title: The usb driver appears to fail To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1151622/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
