I have the same problem with a USB 3.0 Hub. Works fine when plugged in a 2.0 port but not 3.0.
[ 421.219447] hub 9-1:1.0: hub_port_status failed (err = -71) [ 421.219674] hub 9-1:1.0: hub_port_status failed (err = -71) [ 421.331120] usb 9-1: USB disconnect, device number 7 [ 422.119057] usb 9-1: new SuperSpeed USB device number 8 using xhci_hcd [ 422.135656] usb 9-1: Parent hub missing LPM exit latency info. Power management will be impacted. [ 422.139297] usb 9-1: New USB device found, idVendor=2109, idProduct=0811 [ 422.139307] usb 9-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 422.139314] usb 9-1: Product: 4-Port USB 3.0 Hub [ 422.139319] usb 9-1: Manufacturer: VIA Labs, Inc. [ 422.140148] hub 9-1:1.0: USB hub found [ 422.140546] hub 9-1:1.0: 4 ports detected # uname -a Linux cheetah 3.5.0-19-generic #30-Ubuntu SMP Tue Nov 13 17:48:01 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1050352 Title: External USB 3.0 hard drive randomly disconnects and connects To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1050352/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
