The debugging output indicates that interrupts were disabled for something like 9 ms, which means the problem is caused by some other part of the kernel, not by ohci-hcd.
To debug farther, use the ftrace facility. Complete instructions are in Documentation/trace/ftrace.txt, if you're interested. For our purposes here, you should start the irqsoff tracer just before running a test: cd /sys/kernel/debug/tracing echo 0 > options/function-trace echo irqsoff > current_tracer echo 1 > tracing_on echo 0 > tracing_max_latency ... run the test ... echo 0 > tracing_on cat trace The contents of the "trace" file are what we need to see. You can do this with the regular ohci-hcd driver; the diagnostic patch isn't necessary. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1191603 Title: raring-updates: regression: 3.8.0-24.35 causes sporadic failure of USB audio devices To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1191603/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
