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[Bug 1534856] Re: lsusb hangs

 

Sam Shepperd, I'm not sure how being rude and attacking folks who have
knowledge about the linux kernel is going to motivate anyone to want to
help you, let alone fix your problem.

Despite this, in order to allow additional upstream developers to examine the issue, at your earliest convenience, could you please test the latest upstream kernel available from http://kernel.ubuntu.com/~kernel-ppa/mainline/?C=N;O=D ? Please keep in mind the following:
1) The one to test is at the very top line at the top of the page (not the daily folder).
2) The release names are irrelevant.
3) The folder time stamps aren't indicative of when the kernel actually was released upstream.
4) Install instructions are available at https://wiki.ubuntu.com/Kernel/MainlineBuilds .

If testing on your main install would be inconvenient, one may:
1) Install Ubuntu to a different partition and then test this there.
2) Backup, or clone the primary install.

If the latest kernel did not allow you to test to the issue (ex. you couldn't boot into the OS) please make a comment in your report about this, and continue to test the next most recent kernel version until you can test to the issue. Once you've tested the upstream kernel, please comment on which kernel version specifically you tested. If this issue is fixed in the mainline kernel, please add the following tags by clicking on the yellow circle with a black pencil icon, next to the word Tags, located at the bottom of the report description:
kernel-fixed-upstream
kernel-fixed-upstream-X.Y-rcZ

Where X, and Y are the first two numbers of the kernel version, and Z is
the release candidate number if it exists.

If the mainline kernel does not fix the issue, please add the following tags:
kernel-bug-exists-upstream
kernel-bug-exists-upstream-X.Y-rcZ

Please note, an error to install the kernel does not fit the criteria of
kernel-bug-exists-upstream.

Once testing of the latest upstream kernel is complete, please mark this
report's Status as Confirmed. Please let us know your results.

Thank you for your understanding.

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https://bugs.launchpad.net/bugs/1534856

Title:
  lsusb hangs

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  When plugging an external sound card into USB3 ports on my ASUSTeK
  P9X79 motherboard, lsusb hangs and the usb device no longer works.  If
  I plug the sound card into a USB2 port, lsusb does not hang but the
  device is not detected and there are 0 messages printed in dmesg.

  bash$ strace lsusb -v
  munmap(0x7fa344ff3000, 4096)            = 0
  open("/sys/bus/usb/devices/usb3/descriptors", O_RDONLY) = 6
  read(6,

  It hangs on this read and Ctrl-C cannot kill it until I unplug the usb
  device.

  This device was working until maybe 1-2 months ago, I believe when
  signed UEFI kernels started getting pushed to LTS although that is
  just a guess on my part.  I've tried falling back but I can't find a
  kernel that works anymore.

  bash$ uname -a
  3.13.0-74-generic x86_64

  bash$ lsb_release -a
  No LSB modules are available.
  Distributor ID:	Ubuntu
  Description:	Ubuntu 14.04.3 LTS
  Release:	14.04
  Codename:	trusty

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References