On 7 March 2014 18:53, David King <linux...@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 Email: lpro...@cix.co.uk * GMail/G+/Twitter/Flickr/Facebook: lproven MSN: lpro...@hotmail.com * Skype/AIM/Yahoo/LinkedIn: liamproven Tel: +44 20-8685-0498 * Cell: +44 7939-087884 -- ubuntu-uk@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk https://wiki.ubuntu.com/UKTeam/
