On 07/03/14 19:32, Mike Holstein wrote:
On Fri, Mar 7, 2014 at 1:51 PM, David King <[email protected]
<mailto:[email protected]>> wrote:
I am running Ubuntu Studio 12.04 on my PC which I built myself. I
recently upgraded some of the hardware, including the CPU, RAM and
motherboard. I am using the same hard drives and the same
installation of Ubuntu Studio.
When I boot up and if I press ESC during the splash text to see
what is going on (such as when it is doing disk checks), I see a
constantly-repeated error message as follows:
[first some changing numbers] hub 2-0:1.0: unable to enumerate USB
device on port 2
and the same line appears below but the first number is 5 instead
of 2, i.e. hub 5-0:1.0:
Today I am finding after logging into Ubuntu, that Firefox is
working okay and then suddenly it freezes when opening a new tab,
and then the whole PC goes very slow and is unresponsive. Pressing
ALT SysRq REISUB does nothing. Other programs were running as
well, and when it happens the RAM usage goes to maximum (8 GB
installed) and the CPUs get busier (8-core 4 GHz).
The first time it happened I had to do a hard reboot.
The second time it happened the PC was still responding, but only
just. I pressed CTRL ALT F1 to get into a console, but that was
showing the hub 2-0:1.0: unable to enumerate USB device on port 2
message again repeatedly, making it impossible to log in.
Going back to the GUI via CTRL ALT F7 I then managed to close each
window and reboot.
So is the USB device error something that could be causing it to
go slow? Or is it more likely to be a problem with Firefox or one
of its extensions? Or a problem with Ubuntu Studio? I plan to
upgrade the new LTS when it comes out in April or whenever.
When everything works it works well, with the faster CPU than
before it never goes slow, normally. I can have various programs
open and lots of tabs open in Firefox and it handles it smoothly.
So how do I fix this, and get rid of that USB device error and
with the PC running normally without freezing?
the USB messages are likely just that.. messages.. what would i do?
try a live CD and remove my currently installed system from the
equation. i would test the hardware and see that its all installed and
functioning properly. an opportune time to find issues with hardware
is when it is new, or very old, or being physically manipulated. you
could have something as simple as a graphics card driver issue, to
hardware that doesnt support the kernel you are using.. or, you could
have broken something hardware related. remove your installation from
the equation.. see if live CD's run, then, move on to modules you may
have installed on the old hardware that should be removed.. graphics
drivers for example.. cheers and good luck
David King
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MH
likethecow.com <http://likethecow.com>
Thanks for your suggestions.
The slowdown just occured again, when trying to open a link in Firefox
from an email in Thunderbird. I was able to look at the System Monitor
and view the RAM usage, it went to max again, but there was a process
called Browser which was using over 2 GB of RAM, in addition to Firefox
using over 3 GB of RAM (I have a lot of tabs open). So I forceably
closed the Browser process but left Firefox running, and immediately the
RAM usage went down, and the PC was responsive again. However, I also
had to close Firefox as that was not responding.
I am thinking in part it is a bug in Firefox.
As for the USB device, I still have no idea what the error message means
or why it is repeating itself endlessly in the console without stopping.
David K
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