On Fri, 10 Nov 2006, [UTF-8] Lucas Lürich wrote: > Hi there, > > not easy to start, but I'll try: > I've got an IBM Thinkpad and i use it with several usb-yevices. I > already had problems with usb two times and had it repaired by IBM. The > first time usb wasn't working in any way anymore, the second time it was > quite similar to (even though worse than) my problem I have now. > To the devices: > I use three usb-drives (2 hdds, one writer), all (normally) plugged into > a usb2.0 hub. The two hdds work fine atm, but the writer makes problems. > If plugged into the hub its even worse:
> So, of course I have tried different cables and of course I also tried > not to connect the device through the usb-hub. > The cables didn't have any effect, direct connect had. The device is > detected correct and sometimes it even seems to be fine: > The problem here is, that I get many resets. So this doesn't seem > perfect either. > Because having bad experience with the thinkpad usb (two times just > doest't look like accident) I first suspected the usb-controller of my > thinkpad again, but after a little testing i saw that only the writer > really makes trouble. > I can't be really sure, where the problem is to find, is it (or a part > of it, it cannot be the problem alone) the usb hub, the tp-controller, > the writer or even the case of the writer (wasn't very expensive). > Can anyone help me to find the right way? In a situation like you have to try lots of variations to find the culprit. Try using a different computer, try using a different hub (or no hub at all), try using different cables, try different devices, and so on. >From the log it certainly looks like part of the problem was caused by the hub. But that could be an illusion; it's hard to tell. Sometimes it's impossible to pin the blame on one single piece of equipment. I also have a USB hard drive device, which doesn't work on one of my computers. If I attach the same cable and drive to a different computer, they work. If I switch USB cables on the original computer, the drive works. If I keep the computer and cable the same but use a different USB storage device instead of the hard drive, it works. In short, changing any one of the three components fixes the problem -- so which one is at fault? Alan Stern ------------------------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642 _______________________________________________ Linux-usb-users@lists.sourceforge.net To unsubscribe, use the last form field at: https://lists.sourceforge.net/lists/listinfo/linux-usb-users
