Public bug reported:
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
** Affects: linux-lts-trusty (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1534856
Title:
lsusb hangs
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