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[Minsu Park <kingssa@xxxxxxxxx>]

I applied below patch in my linux-3.8.13.
https://lkml.org/lkml/2013/8/18/203
<"[ 35/45] USB: EHCI: accept very late isochronous URBs">

After then, I got a lot of warning messages like as below.
[  133.760978] ehci 100f0000.ehci: iso underrun e07c1840 (3375+0 < 5472)
[  133.760999] ehci 100f0000.ehci: iso underrun e07c1d80 (3383+0 < 5473)
[  133.761023] ehci 100f0000.ehci: iso underrun e07c1e40 (3391+0 < 5473)
[  133.761046] ehci 100f0000.ehci: iso underrun e07c16c0 (3399+0 < 5473)
[  133.761067] ehci 100f0000.ehci: iso underrun e07c10c0 (3407+0 < 5473)
[  133.761088] ehci 100f0000.ehci: iso underrun e07c1f00 (3415+0 < 5473)
[  133.761110] ehci 100f0000.ehci: iso underrun e07c1000 (3423+0 < 5474)
[  133.761132] ehci 100f0000.ehci: iso underrun e07c1900 (3431+0 < 5474)
[  133.761152] ehci 100f0000.ehci: iso underrun e07c1840 (3439+0 < 5474)
[  133.761172] ehci 100f0000.ehci: iso underrun e07c1d80 (3447+0 < 5474)
[  133.761191] ehci 100f0000.ehci: iso underrun e07c1e40 (3455+0 < 5474)
[  133.761211] ehci 100f0000.ehci: iso underrun e07c16c0 (3463+0 < 5474)
[  133.761233] ehci 100f0000.ehci: iso underrun e07c10c0 (3471+0 < 5475)
[  133.761253] ehci 100f0000.ehci: iso underrun e07c1f00 (3479+0 < 5475)
[  133.761271] ehci 100f0000.ehci: iso underrun e07c1000 (3487+0 < 5475)
[  133.761292] ehci 100f0000.ehci: iso underrun e07c1900 (3495+0 < 5475)
[  133.761312] ehci 100f0000.ehci: iso underrun e07c1840 (3503+0 < 5475)
[  133.761331] ehci 100f0000.ehci: iso underrun e07c1d80 (3511+0 < 5475)
.......

When audio process was dead, my webcam does not recognize about process dead. So webcam continuously send audio data to my system.
At that time, continuously above warning messages were occured, and my system was slowed.
As I knew, this message is in irq routine. If system print a lot of messages, system will be slowed.
How can I solve this problem?

Thanks
Minsu

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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1191603

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

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  The 3.8.0-24.35 kernel update in raring introduced sporadic failure of
  USB audio devices. The symptoms are that the device suddenly stops
  working and you get the following dmesg output:

  [ 7532.838274] cannot submit urb (err = -18)
  [ 7532.838283] cannot submit urb (err = -18)
  [ 7532.838291] cannot submit urb (err = -18)
  [ 7532.842224] delay: estimated 288, actual 96
  [ 7532.922160] delay: estimated 432, actual 96

  This bug has been introduced by the following commits (UHCI: implement new semantics for URB_ISO_ASAP, OHCI: implement new semantics for URB_ISO_ASAP):
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=c44b225077bb1fb25ed5cd5c4f226897b91bedd4
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=6a41b4d3fe8cd4cc95181516fc6fba7b1747a27c

  A fix has been released (USB: fix latency in uhci-hcd and ohci-hcd):
  https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=e1944017839d7dfbf7329fac4bdec8b4050edf5e

  The fix hasn't been backported to 3.8 yet, but as this bug was
  introduced to raring by pulling upstream kernel changes, it would be
  nice to backport the fix to raring as soon as possible.

  For further reference:
  http://markmail.org/message/gt554vejrjkutsfw#query:+page:1+mid:gt554vejrjkutsfw+state:results
  https://bbs.archlinux.org/viewtopic.php?id=163891
  http://comments.gmane.org/gmane.linux.usb.general/85343
  http://lists.opensuse.org/opensuse-bugs/2013-05/msg01617.html

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