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[Alan Pope  <alan@xxxxxxxxxx>]

Tried 4.0-rc4 on vivid and saw none of the xhci error messages I saw on
3.19. I performed exactly the same operation using the same hardware,
namely ddrescuing an ~7.5GB image to an 8GB stick.

alan@deep-thought:/data/usb⟫ dmesg -T | grep xhci_hcd
[Mon Mar 16 19:48:40 2015] xhci_hcd 0000:0e:00.0: xHCI Host Controller
[Mon Mar 16 19:48:40 2015] xhci_hcd 0000:0e:00.0: new USB bus registered, assigned bus number 1
[Mon Mar 16 19:48:40 2015] xhci_hcd 0000:0e:00.0: hcc params 0x014042cb hci version 0x96 quirks 0x00000004
[Mon Mar 16 19:48:40 2015] xhci_hcd 0000:0e:00.0: xHCI Host Controller
[Mon Mar 16 19:48:40 2015] xhci_hcd 0000:0e:00.0: new USB bus registered, assigned bus number 2
[Mon Mar 16 19:49:49 2015] usb 2-1: new SuperSpeed USB device number 2 using xhci_hcd
[Mon Mar 16 19:49:50 2015] usb 1-1: new high-speed USB device number 2 using xhci_hcd
[Mon Mar 16 19:49:59 2015] usb 2-1.3: new SuperSpeed USB device number 3 using xhci_hcd
[Mon Mar 16 19:54:59 2015] usb 2-1.3: new SuperSpeed USB device number 4 using xhci_hcd

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https://bugs.launchpad.net/bugs/1371233

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

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

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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