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[Naser Ali <naserali01@xxxxxxxxxxx>]

I have  an Intel NUC D54250WYK running BIOS V32, Ubuntu 14.04 and Unity
with a very similar issue. If I boot with the 290e tuner attached and
then turn on an external DAC, the Cambridge Audio DacMagic 100, all the
USB ports fail. Logs show the same xHCI host crash.

I found two ways to deal with the problem.

1. Uninstall the MythTV backend - undesirable
2. Remove the 290e usb tuner during booting. Putting it in after a minute after booting means both DAC and 290e coexist, but they used to without this complication at the beginning of the year using, still on the same NUC on Trusty.

Still looks like a kernel bug.

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https://bugs.launchpad.net/bugs/1313279

Title:
  xHCI host not responding to stop endpoint command

Status in The Linux Kernel:
  Unknown
Status in linux package in Ubuntu:
  Confirmed

Bug description:
  Description:	Ubuntu 14.04 LTS
  Release:	14.04
  Hardware: Intel NUC D34010WYK (Core i3 4010U)
  Memory: 4 gigabytes
  USD device: PCTV 292e DVB-T tuner

  I have 2 PCTV 292e DVB-T tuners connected to the system. When I start
  to use either of the tuner, the xHCI host crashes. Since I'm booting
  from an USB disk. If I only connect 1 of the tuners, the system works
  ok. It does not matter which one of the tuners I connect.

  [   68.990396] xhci_hcd 0000:00:14.0: xHCI host not responding to stop endpoint command.
  [   68.990402] xhci_hcd 0000:00:14.0: Assuming host is dying, halting host.

  Sometimes this also leads to this:

  [  638.183002] IP: [<ffffffff815325dd>] usb_enable_link_state+0x2d/0x2f0
  [  638.183057] PGD 0 
  [  638.183077] Oops: 0000 [#1] SMP 

  I can also observe the same fault with OpenELEC Linux distribution
  that runs kernel 3.14 when I run the system from an internal SATA SSD
  drive (not from an external USB disk).

  lsusb -v: http://paste.ubuntu.com/7343384/
  dmesg: http://sprunge.us/HMXH
  dmesg (crash type 2): http://sprunge.us/PSiX

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: lubuntu-desktop 0.55
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  Date: Sun Apr 27 11:12:22 2014
  InstallationDate: Installed on 2014-04-07 (19 days ago)
  InstallationMedia: Lubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
  SourcePackage: lubuntu-meta
  UpgradeStatus: Upgraded to trusty on 2014-04-26 (0 days ago)

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