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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:

  • Try using a previous kernel. While booting, go to advanced options and select a older kernel. – Registered User Sep 7 '15 at 12:13
  • refer here – Ravan Sep 7 '15 at 12:32
  • Curiously, if I start Ubuntu from the "advanced optons" tab, it always work, even though I select the fist one, which happens to be this one: 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? – il mietitore Sep 7 '15 at 12:34
  • @Ravan that's not the case: none of the things connected to the drives work, except the fan. Also, it doesn't happen when I'm already using the computer; it happens only on startup. – il mietitore Sep 7 '15 at 12:37
  • It would help to see the full output of 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. – David Foerster Sep 15 '15 at 10:47
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Registered User correctly suggested that this problem was related to the kernel.

He was right. The 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 kernel is the one giving problems. I guess it's not fully compatible with Acer Aspire E 15 computers.

The best working kernel seems to be this one: Linux version 3.13.0-61-generic (buildd@lgw01-50) (gcc version 4.8.2 (Ubuntu 4.8.2-19ubuntu1) ) #100-Ubuntu SMP Wed Jul 29 11:21:34 UTC 2015.

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