[ubuntu-uk] PC slowing down and freezing after upgrade of hardware

Liam Proven lproven at gmail.com
Sat Mar 8 14:39:02 UTC 2014

On 7 March 2014 18:53, David King <linuxman at avoura.com> 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?

Is your new BIOS/firmware full updated?

What kernel are you running?

Have you tried the newer backport kernels?

Liam Proven * Profile: http://lproven.livejournal.com/profile
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