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[Prophet6 <1050352@xxxxxxxxxxxxxxxxxx>]

I can confirm this same behavour and error as the OP using a Gigabyte
GA-990FXA-UD3 motherboard.

USB3.0 external drive (Seagate GoFlex) does not function in USB3.0 port,
but does work in USB2 ports (at USB2 speeds).

USB3 flash drives DO work in USB3 ports, but do not work at USB3.0
speeds.

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https://bugs.launchpad.net/bugs/1050352

Title:
  [Gigabyte P55A-UD4] External USB 3.0 hard drive randomly disconnects
  and connects

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Ubuntu 12.10 AMD64, kernel 3.5.0-14.16.
  External hard drive Hitachi Touro Desk 3.0 connected to USB 3.0 port.

  Gets disconnected randomly and then connected again. Only happens with
  USB 3.0 connection (xhci).

  WORKAROUND: When plugged to USB 2.0 (ehci) port it works ok.

  Attached is related kernel log portion: there is nothing special there
  except for these lines:

  11-2: Parent hub missing LPM exit latency info.  Power management will be impacted.
  usb 11-2: USB disconnect, device number 2
  ---
  AcpiTables: Error: command ['pkexec', '/usr/share/apport/dump_acpi_tables.py'] failed with exit code 127: Error executing /usr/share/apport/dump_acpi_tables.py: Permission denied
  ApportVersion: 2.5.1-0ubuntu7
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC2:  dmitry     3011 F.... pulseaudio
   /dev/snd/controlC1:  dmitry     3011 F.... pulseaudio
   /dev/snd/controlC0:  dmitry     3011 F.... pulseaudio
  CRDA: Error: command ['iw', 'reg', 'get'] failed with exit code 1: nl80211 not found.
  DistroRelease: Ubuntu 12.10
  EcryptfsInUse: Yes
  HibernationDevice: RESUME=UUID=e3fa02f8-4f15-4f00-9d79-e982d4837b5c
  IwConfig:
   vboxnet0  no wireless extensions.

   eth0      no wireless extensions.

   lo        no wireless extensions.
  MachineType: Gigabyte Technology Co., Ltd. P55A-UD4
  NonfreeKernelModules: nvidia
  Package: linux (not installed)
  ProcFB: 0 VESA VGA
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-14-generic root=UUID=33c3405d-4b3c-4b5c-a1c3-fd2c7bad1c79 ro quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.5.0-14.16-generic 3.5.3
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-14-generic N/A
   linux-backports-modules-3.5.0-14-generic  N/A
   linux-firmware                            1.91
  RfKill:

  Tags:  quantal running-unity
  Uname: Linux 3.5.0-14-generic x86_64
  UpgradeStatus: Upgraded to quantal on 2012-09-07 (6 days ago)
  UserGroups: adm cdrom dialout fuse kvm libvirtd lpadmin plugdev pulse pulse-access sambashare sudo vboxusers wireshark
  dmi.bios.date: 08/10/2010
  dmi.bios.vendor: Award Software International, Inc.
  dmi.bios.version: F14
  dmi.board.name: P55A-UD4
  dmi.board.vendor: Gigabyte Technology Co., Ltd.
  dmi.board.version: x.x
  dmi.chassis.type: 3
  dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
  dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF14:bd08/10/2010:svnGigabyteTechnologyCo.,Ltd.:pnP55A-UD4:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnP55A-UD4:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
  dmi.product.name: P55A-UD4
  dmi.sys.vendor: Gigabyte Technology Co., Ltd.

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