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[Jon-o Addleman <jono@xxxxxxxxx>]

Finally had a chance to test this with a more recent kernel... With the
latest in Saucy (3.11.0-12-generic) I get the same error. I'll try with
v3.12-rc6-saucy too, though I don't see any reason for it to change
there.

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https://bugs.launchpad.net/bugs/1177394

Title:
  USB  sequence errors in snd_usb_usx2y

Status in “linux” package in Ubuntu:
  Expired

Bug description:
  Using kernel 3.8.0.19.35, when I plug in my Tascam us-122 usb audio
  device, the log fills up with many of the following messages as soon
  as the firmware is loaded:

  May  5 18:40:31 scaph kernel: [64138.774214] Sequence Error!(hcd_frame=391894 ep=10out;wait=391892,frame=391890).
  May  5 18:40:31 scaph kernel: [64138.774214] Most probably some urb of usb-frame 391892 is still missing.
  May  5 18:40:31 scaph kernel: [64138.774214] Cause could be too long delays in usb-hcd interrupt handling.

  The device seems to initialize properly, but any attempt to actually
  use it (starting jackd for example) results in a few more of those
  messages in the log, and the program fails to connect to the device.

  This is very similar to a bug that cropped up several years ago -
  here's a thread I made on the alsa-user list back in 2006 (!) about
  that one: http://www.mail-archive.com/alsa-
  user@xxxxxxxxxxxxxxxxxxxxx/msg18003.html That bug was fixed in  2.6.18
  so I don't know if it might be actually related or not.

  In any case, I've temporarily solved the issue by downgrading to
  quantal's kernel, 3.5.0-28, which doesn't have the bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: linux-image-generic 3.8.0.19.35
  ProcVersionSignature: Ubuntu 3.5.0-28.48-generic 3.5.7.9
  Uname: Linux 3.5.0-28-generic i686
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  jono       1741 F.... pulseaudio
  Date: Tue May  7 09:31:02 2013
  HibernationDevice: RESUME=UUID=21e8f32e-d542-4900-ac9c-2ade76ed3084
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: LENOVO 170237U
  MarkForUpload: True
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.5.0-28-generic root=UUID=860958bf-acf0-48eb-abb6-acd3022e5a9c ro quiet splash
  RelatedPackageVersions:
   linux-restricted-modules-3.5.0-28-generic N/A
   linux-backports-modules-3.5.0-28-generic  N/A
   linux-firmware                            1.106
  RfKill:
   0: phy0: Wireless LAN
   	Soft blocked: no
   	Hard blocked: no
  SourcePackage: linux
  UpgradeStatus: Upgraded to raring on 2013-04-13 (23 days ago)
  WifiSyslog:
   
  WpaSupplicantLog:
   
  dmi.bios.date: 03/31/2011
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 7BETD8WW (2.19 )
  dmi.board.name: 170237U
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr7BETD8WW(2.19):bd03/31/2011:svnLENOVO:pn170237U:pvrThinkPadX60s:rvnLENOVO:rn170237U:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 170237U
  dmi.product.version: ThinkPad X60s
  dmi.sys.vendor: LENOVO

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