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[Vladimir <vladimir@xxxxxxxxxxxxxxxx>]

** Attachment added: "lsusb hierarchy"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1559298/+attachment/4603729/+files/usb-hierarachy

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https://bugs.launchpad.net/bugs/1559298

Title:
  liveusb booting issue due to xhci disconnect on dell precision 5510

Status in linux package in Ubuntu:
  New

Bug description:
  After creating a LiveUSB image and trying to boot it, unrecoverable
  squashfs errors are encountered because the usb stick disconnects. The
  laptop is a Dell Precision 5510 system (similar to the new Dell XPS
  15).

  I've not been able to get a full log in this situation, parameters
  like rootdelay= do not help although the boot process goes further.

  The details below are after booting with toram which seems to side-
  step this problem. I haven't been able to get logs from the non-
  booting case yet because some key programs like mount do not get
  cached and therefore can't be found.

  Steps to reproduce:

  1. Create a 16.04 LiveUSB from daily image
  2. Try and boot system from LiveUSB
  3. Get lots of errors during boot because of the mass storage device disconnecting during boot

  Expected behavior:

  1. System boots into linux.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.04
  Package: linux-image-4.4.0-10-generic 4.4.0-10.25
  ProcVersionSignature: Ubuntu 4.4.0-10.25-generic 4.4.3
  Uname: Linux 4.4.0-10-generic x86_64
  ApportVersion: 2.20-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1953 F.... pulseaudio
  CasperVersion: 1.367
  CurrentDesktop: Unity
  Date: Fri Mar 18 20:33:07 2016
  LiveMediaBuild: Ubuntu 16.04 LTS "Xenial Xerus" - Alpha amd64 (20160307)
  MachineType: Dell Inc. Precision 5510
  ProcEnviron:
   TERM=xterm-256color
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/ubnkern initrd=/ubninit file=/cdrom/preseed/username.seed boot=casper debug loglevel=8 toram ---
  RelatedPackageVersions:
   linux-restricted-modules-4.4.0-10-generic N/A
   linux-backports-modules-4.4.0-10-generic  N/A
   linux-firmware                            1.156
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/25/2016
  dmi.bios.vendor: Dell Inc.
  dmi.bios.version: 01.01.19
  dmi.board.name: 08R8KJ
  dmi.board.vendor: Dell Inc.
  dmi.board.version: A00
  dmi.chassis.type: 9
  dmi.chassis.vendor: Dell Inc.
  dmi.modalias: dmi:bvnDellInc.:bvr01.01.19:bd01/25/2016:svnDellInc.:pnPrecision5510:pvr:rvnDellInc.:rn08R8KJ:rvrA00:cvnDellInc.:ct9:cvr:
  dmi.product.name: Precision 5510
  dmi.sys.vendor: Dell Inc.

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