Confirmed that this bug also affects linux-image-4.4.0-040400-generic
This device did work on trusty on some older 3.X kernel so this must be
an upstream regression.
** Tags removed: lsusb
** Tags added: kernel-bug-exists-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/1534856
Title:
lsusb hangs
Status in linux package in Ubuntu:
Confirmed
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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