Something went wrong with that last test.  I'm not sure why -- maybe the
patch was tracking the wrong endpoint.  As just one example, the output
should have stopped after those "cannot submit urb" errors.

Anyway, here's a revised version of the patch.  It will provide slightly
different output, and hopefully not so much as before.  When running the
test, you should try to avoid using any other USB devices as much as
possible.  In fact, unplug as many of them as you can.

The first line of output from the patch will be labelled "Alan start";
I'll need to see it to verify that it is working properly.  After that,
there should not be much more output until the problem occurs.  If there
is a lot of output in the first few seconds of the test, you might as
well stop right there and post the results.

** Attachment added: "Diagnostic patch for OHCI interrupt gaps"
   
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1191603/+attachment/3723579/+files/ohci-test-irqs

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https://bugs.launchpad.net/bugs/1191603

Title:
  raring-updates: regression: 3.8.0-24.35 causes sporadic failure of USB
  audio devices

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