I work with Ubuntu Studio 14.04 since an year, and I never had issues related to USB ports.
Now, since a week or so, all of my USB ports (two 2.0 and one 3.0) stopped working. Initially this happened only sometimes, and a reboot could fix it. Now, since three days, it happens all the times.
I know it's a linux problem and not an hardware one since I have a dual-boot (the other OS being Windows 8) and in Windows everything works fine. Also, in the boot screen I can see that the USB ports work since the red light in my mouse is lit, and it shuts down after I boot Ubuntu Studio.
Of course I want this to revert back to normal.
Do you have suggestions?
EDIT 1: (15/09/2015)
Further tests showed that while Linux version 3.13.0-61
always workss, both in generic
and lowlatency
mode, Linux version 3.13.0-62
and Linux version 3.13.0-63
usually don't, even though sometimes, randomly, they'll do. This happens both in lowlatency
and generic
modes.
I was suggested to upload a full output of sudo dmesg
. Notice that apparently the terminal is not long enough to show all the message, but here's the output of a working 3.13.0-61 generic kernel, and here's the output of 3.13.0-63 lowlatency one.
EDIT 2: (16/09/2015)
Here's the complete output of sudo dmesg
:
Here is the shortened version, with just the things referring to USB ports:
Linux version 3.13.0-63-lowlatency (buildd@lgw01-18) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #103-Ubuntu SMP PREEMPT Fri Aug 14 22:23:32 UTC 2015
. That's the same that should be booted via "the normal way". I notice that sometimes, when I start Ubuntu the normal way, all the icons on the desktop gets messed up. I don't know if this might somehow be related. Is there a way I can report these issues?sudo dmesg
after such a total USB bus failure. You'll probably want to upload it to pastebin.ubuntu.com or similar and include a link in your question.