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

Roberto Verzola rverzola at gn.apc.org
Sat Mar 29 22:25:59 UTC 2014

Do you boot your machine with a USB drive on the usb port? Try booting 
without the usb drive, and insert it only after the boot process is 


David King 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?
> David King

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