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[Robert Oswald <1371233@xxxxxxxxxxxxxxxxxx>]

Tried your workaround but problem still exists.

Log:
Nov  6 21:35:38 rodomp01 kernel: [  289.927150] sd 4:0:0:0: [sdb] uas_eh_abort_handler ffff88021311cd80 tag 0, inflight: CMD IN
Nov  6 21:35:41 rodomp01 kernel: [  292.927539] scsi host4: uas_eh_task_mgmt: ABORT TASK timed out
Nov  6 21:35:41 rodomp01 kernel: [  292.927588] sd 4:0:0:0: uas_eh_device_reset_handler
Nov  6 21:35:41 rodomp01 kernel: [  292.927597] scsi host4: uas_eh_task_mgmt: LOGICAL UNIT RESET: error already running a task
Nov  6 21:35:41 rodomp01 kernel: [  292.927603] scsi host4: uas_eh_bus_reset_handler start
Nov  6 21:35:41 rodomp01 kernel: [  292.927669] usb 3-1: stat urb: killed, stream 2
Nov  6 21:35:41 rodomp01 kernel: [  292.927763] sd 4:0:0:0: [sdb] uas_data_cmplt ffff88021311cd80 tag 0, inflight: CMD abort
Nov  6 21:35:41 rodomp01 kernel: [  292.927770] sd 4:0:0:0: [sdb] data cmplt err -2 stream 2
Nov  6 21:35:41 rodomp01 kernel: [  292.927804] sd 4:0:0:0: [sdb] uas_zap_dead ffff88021311cd80 tag 0, inflight: CMD abort
Nov  6 21:35:41 rodomp01 kernel: [  292.927822] sd 4:0:0:0: [sdb] abort completed
Nov  6 21:35:41 rodomp01 kernel: [  293.039920] usb 3-1: reset SuperSpeed USB device number 2 using xhci_hcd
Nov  6 21:35:41 rodomp01 kernel: [  293.056271] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800d620f000
Nov  6 21:35:41 rodomp01 kernel: [  293.056277] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800d620f048
Nov  6 21:35:41 rodomp01 kernel: [  293.056280] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800d620f090
Nov  6 21:35:41 rodomp01 kernel: [  293.056283] xhci_hcd 0000:00:14.0: xHCI xhci_drop_endpoint called with disabled ep ffff8800d620f0d8
Nov  6 21:35:41 rodomp01 kernel: [  293.057750] scsi host4: uas_eh_bus_reset_handler success

cat /proc/cmdline:
BOOT_IMAGE=/vmlinuz-3.16.0-51-generic root=UUID=cee44af9-c463-4cf1-ac47-36add5959072 ro quiet splash usbcore.autosuspend=-1 vt.handoff=7

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Title:
  USB 3.0 connection is unreliable + xHCI xhci_drop_endpoint called with
  disabled ep

Status in linux package in Ubuntu:
  Incomplete
Status in linux source package in Trusty:
  Incomplete
Status in linux source package in Utopic:
  Incomplete
Status in linux source package in Vivid:
  Incomplete

Bug description:
  based on https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1358871/comments/7 I tested with the HDD enclosure IcyBox IB-351 series with USB 3.0 connection with the same result (connection drops after 300 MB reading, error message "xHCI xhci_drop_endpoint called with disabled ep" occurs sometimes, other devices (e.g. Samsung HD103SI 1 TB HDD connected with 3.0 USB adapter to eSATA of enclosure) read hundreds of GB before failing, but definitely do before reading 1TB). Reading tested with `dd`, `gpart` and `btrfsck`.
  Also confirmed on Lenovo IdeaPad-Z500 after BIOS update to 71CN51WW(V1.21) (changelog didn't indicate any USB issues anyway). Also confirmed with 3.16.3 and 3.16.0-14 on Ubuntu 14.10-beta1 after updates.
  The issue seems to cause failure of ASIX AX179 gigabit ethernet chip as well, but is independent from the usage of the ethernet adapter.
  I'm without any clue and stuck with an unreliable USB and ethernet connection which basically means no I/O out of the machine!!

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: linux-image-3.13.0-35-generic 3.13.0-35.62
  ProcVersionSignature: Ubuntu 3.13.0-35.62-generic 3.13.11.6
  Uname: Linux 3.13.0-35-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.4
  Architecture: amd64
  AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/by-path', '/dev/snd/controlC0', '/dev/snd/hwC0D0', '/dev/snd/hwC0D3', '/dev/snd/pcmC0D0c', '/dev/snd/pcmC0D0p', '/dev/snd/pcmC0D3p', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1:
  CurrentDesktop: Unity
  Date: Thu Sep 18 19:58:24 2014
  EcryptfsInUse: Yes
  InstallationDate: Installed on 2014-09-10 (8 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  MachineType: LENOVO 20221
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=de_DE.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-3.13.0-35-generic.efi.signed root=UUID=5e999111-7efe-4818-b9e8-a950ad6d3296 ro rootflags=subvol=@ quiet splash nomdmonddf nomdmonisw vt.handoff=7
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-35-generic N/A
   linux-backports-modules-3.13.0-35-generic  N/A
   linux-firmware                             1.127.5
  SourcePackage: linux
  StagingDrivers: rts5139
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 07/12/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 71CN51WW(V1.21)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Z500 Touch
  dmi.modalias: dmi:bvnLENOVO:bvr71CN51WW(V1.21):bd07/12/2013:svnLENOVO:pn20221:pvrLenovoIdeaPadZ500Touch:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadZ500Touch:
  dmi.product.name: 20221
  dmi.product.version: Lenovo IdeaPad Z500 Touch
  dmi.sys.vendor: LENOVO

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