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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

A patch was sent to stable.  However, some of the stable kernel versions
fail to build with this patch, 3.2.y and 3.13.y for example.  This is
because the function 'find_trb_seg' is still called by xhci_cmd_to_noop,
which is removed from mainline but still exists in the stable kernels.
The patch removes the definition of find_trb_seg, which is what causes
the build to fail.

I built a trusty test kernel with a modified version of the upstream
patch to not remove the find_trb_seg function.  If this patch resolves
this bug, we can ask the 3.13 upstream stable maintainer to modify the
patch similarly as well as ask for an SRU to trusty with the fix.

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1350480

Can you give this latest kernel a test and see if it resolves the bug?

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https://bugs.launchpad.net/bugs/1350480

Title:
  [REGRESSION] Kernel update renders Intel NUC (i5-3427) unbootable with
  USB devices plugged in

Status in The Linux Kernel:
  Unknown
Status in “linux” package in Ubuntu:
  In Progress
Status in “linux” source package in Precise:
  In Progress
Status in “linux” source package in Trusty:
  In Progress
Status in “linux” source package in Utopic:
  In Progress

Bug description:
  The latest kernel update in Ubuntu 14.04 LTS (3.13.0-32.57) renders
  our Intel NUCs unbootable, when we cold boot and have USB devices
  (keyboard, mouse, USB/Ethernet adapter) connected.

  The 3.13.0-24.47 kernel does not exhibit this behavior.

  Our particular NUCs have the i5-3427U processor, which is the
  D53427RKE board (DC53427HYE kit).

  These reports seem to be related:
  http://support.sundtek.com/index.php/topic,1600.0.html
  http://en.it-usenet.org/thread/19505/17700/
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     1400 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  HibernationDevice: RESUME=UUID=37e4ff56-b945-4604-a94d-557bdf83e0b2
  InstallationDate: Installed on 2014-07-30 (0 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Release amd64 (20140417)
  Package: linux (not installed)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic.efi.signed root=UUID=c0597da2-7d4a-4340-b85a-c7f96d8262d7 ro
  ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-24-generic N/A
   linux-backports-modules-3.13.0-24-generic  N/A
   linux-firmware                             1.127.5
  Tags:  trusty
  Uname: Linux 3.13.0-24-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 04/25/2013
  dmi.bios.vendor: Intel Corp.
  dmi.bios.version: RKPPT10H.86A.0017.2013.0425.1251
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: D53427RKE
  dmi.board.vendor: Intel Corporation
  dmi.board.version: G87790-403
  dmi.chassis.type: 3
  dmi.modalias: dmi:bvnIntelCorp.:bvrRKPPT10H.86A.0017.2013.0425.1251:bd04/25/2013:svn:pn:pvr:rvnIntelCorporation:rnD53427RKE:rvrG87790-403:cvn:ct3:cvr:

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