sounds like a power problem to me, is it a powered usb hub (with a plug/adapter/transformer)
On 29 September 2010 20:54, Glen Mehn <glen.m...@oba.co.uk> wrote: > Hi Paul, > > I've had no problems with this from, broadly, 7.x to 10.04/10.10. > > /media should be dynamically creating folder names to mount things. > > From what I can tell, you have several problems of problems: > > 1 - the Sansa MP3 player sometimes mounts and sometimes randomly unmounts > 2 - the USB hard drive mounts when plugged in directly, but not via the hub > 3 - you can only access one USB drive through the hub > > Is that correct? > > The behaviour you're describing sounds rather a lot like something I > have experienced: a dodgy USB cable and/or connection-- you might check > the cable, the socket on the hub, and the socket on the mp3 player. > > Once you've cleared cables, try this: > > What is the output of "lsusb" with: > - evertything unplugged > - the hub only plugged in (no devices attached to it) > - the hub plugged in with 1, then 2 devices attached to it. > > That'll let you know waht the USB bus is seeing. You might also google > the model number of your hub and "linux" or "ubuntu" to see if other > folks are experiencing the same issue. I would suspect that the system > isn't seeing the hub as a hub, so only able to attach one device on to it. > > Hope this helps. > > Glen > > On 29/09/10 20:05, Paul Sutton wrote: > > Hi > > > > using ubuntu 10,04 I am trying to copy data to a sansa clip usb mp3 > player > > > > if I plug it in as me, then it sometimes mounts and I can view the data > > on it, however it does not always mount properly or seems to randomly > > disconnect and the icon is removed from the desktop > > > > my user is a admin user on ubuntu, > > > > if i try and plug it in as a normal user nothing seems to happen at all > > with the music device, the external hard disk seems well behaved for the > > most part. > > > > i also have a usb hard disk which if plugged in to the desktop system, > > directly mounts, if I try and plug this in to the usb external hub it > > won't mount, > > > > if I try and plug both devices in to the external hub i get either one > > or the other mounting, but not both if they are both plugged in > > > > are there issues with dbus that can cause problems > > > > what has changed in terms of the content of /media it used to have > > folders which I now understand are dynamically created. > > > > before we had folders that acted as mount points, something has changed > > between 10.04 and earlier versions in the way ubuntu handles things I am > > getting lots of messages referring to dbus, so not sure if there are > > know bugs in that. > > > > I am really really struggling to explain exactly what the situation is > > as to me it seems random, sometimes I can plug the music device in and > > it works. It just seems to randomly work, i am worried as to why > > something would just unmount for no aparent reason (or appear to) > > > > i did manage to get both working, and tried to copied 2 folders of music > > across to the player only half way through the copy dialog seemed to be > > stalled, so after a while i ended it, and tried to unmount, i then got > > another dialog saying it was writing remaining data, which again didn't > > seem to be doing much, just displaying a status box with another bar > > moving back and forth quickly. > > > > has anyone else had any issues trying to plug in two usb storage devices. > > > > > > Paul > > > > > > -- > Glen Mehn > glen.m...@oba.co.uk > skype: glenmehn | blog: http://glen.mehn.net/mba > UK: +44(0)7942 675 755 | US: +1 415 704 4737 > > > -- > ubuntu-uk@lists.ubuntu.com > https://lists.ubuntu.com/mailman/listinfo/ubuntu-uk > https://wiki.ubuntu.com/UKTeam/ >
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