← Back to team overview

kernel-packages team mailing list archive

[Bug 1191603] Re: raring-updates: regression: 3.8.0-24.35 causes sporadic failure of USB audio devices


If it's xHCI then there's nothing I can do.  If it's EHCI then the
attached patch ought to help.  For debugging purpose it writes a warning
message to the kernel log whenever an underrun occurs, but it prevents
the underrun from causing a failure.

It turns out there are two bugs in the snd-usb-audio driver, either of
which may be affecting you.  There's a patch for one of the bugs at
<http://marc.info/?l=linux-usb&m=137288343602140&w=2>, but there's no
fix for the other bug (not enough URBs submitted).

** Attachment added: "Accept URB submissions during underruns, with a warning"

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

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

Status in “linux” package in Ubuntu:

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):

  A fix has been released (USB: fix latency in uhci-hcd and ohci-hcd):

  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:

To manage notifications about this bug go to:

Follow ups