Comment 17 for bug 1151622

On 08/10/13 01:32, Christopher M. Penalver wrote:
> tomdean, did this problem not occur in a release prior to Precise?
>

I do not know. I do not have prior releases. I did not have the USB
3.0 hub prior to my reporting the problem. I reported this problem the
first time I connected the 3.0 hub to my computer.

The problem is not that the error message happens. The problem is that
with linux after 3.2.0-38-generic, the error happens in a loop, forever.
  That has a severe impact on system performance.

The important part of the previous sentence is 'in a loop'. Linux is
distinct from Ubuntu. I can boot different kernels from Ubuntu 12.04.2
LTS at the grub prompt.

I outlined the following to make the two cases distinct. I am sorry if
I caused confusion by having two cases in one response.

The good case: Boot Ubuntu 12.04 with linux 3.2.0-38 from grub
========================================================================
=
= With the following combination, the looping and degraded performance =
does NOT happen.
=
= > lsb_release -a
= LSB Version: core-2.0-amd64:core-2.0-noarch:core-
= 3.0-amd64:core-=3.0-noarch:core-3.1-amd64:core-3.1-noarch:core-
= 3.2-amd64:core-3.2-noarch:core-4.0-amd64:core-4.0-noarch
= Distributor ID: Ubuntu
= Description: Ubuntu 12.04.2 LTS
= Release: 12.04
= Codename: precise
=
= > uname -a
= Linux P9X79 3.2.0-38-generic #61-Ubuntu SMP Tue Feb 19 12:18:21 UTC
= 2013 x86_64 x86_64 x86_64 GNU/Linux
=
= The message appears one time for each failed address assignment. And
= then stops. There is NO looping. There is NO slinky scrolling. The
= system response is very good.
=
=======================================================================

The failed case: Boot Ubuntu 12.04 with linux 3.2.0-40 from grub
=======================================================================
=
= If I reboot and select linux 3.2.0-40 or linux 3.2.0-51 from the grub
= menu, the looping happens and system performance is seriously
= degraded. This has happened with a couple other linux kernels, but,
= I did not keep them installed.
=
= Note that I am still running Ubuntu 12.04.2 LTS, just a different
= kernel.
=
= If I watch the console, the error messages scroll by continuously! I
= have not watched for more than 10 minutes, but, at least that long.
= The one time I did startx while the looping condition existed, I may
= have used the system for another 5 minutes, or so, with sluggish
= response ane slinky scrolling
=
=======================================================================

I hope this is clear.

I can boot the failing case and attempt to generate some information
from there, if that will help.

What can I do to help?

Tom Dean