kernel-packages team mailing list archive

[Sam Shepperd <samshepperd@xxxxxxxxx>]

This seems to be a regression specifically with the C-Media USB Audio chipset.  At least C-Media CM6632 and CM6631A are affected:
http://article.gmane.org/gmane.linux.usb.general/136685

Unfortunately I have not been able to find an older Ubuntu kernel where
this works yet.  But I can at least confirm the following kernels all
contain the problem:

3.5.0-17.28
3.7.0-0
3.9.0-generic
3.10.0-generic
3.12.0-2-generic
3.12.0-4-generic
3.13.0-24-generic
3.13.0-30-generic
3.13.0-40-generic
3.13.0-51-generic
3.13.0-76-generic
4.2.0-25-generic
4.4
4.5-rc1
4.5-rc2

I will continue testing older kernels.

** Tags removed: kernel-bug-exists-upstream-4.5-rc1
** Tags added: kernel-bug-exists-upstream-4.5-rc2

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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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