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Thread: USB detected on CD boot, no USB on HD boot

  1. #1
    Junior Member
    Join Date
    Nov 2003
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    8

    USB detected on CD boot, no USB on HD boot

    USB ports are detected when Knoppix boots from the CD in the kinfocenter, but after doing a hard drive installation, USB ports are not recognized in the kinfocenter. However, during the HD boot during the verbose mode, I notice that it says "USB hub found, 2 ports" which is exactly what I have on this computer. Plus, other sections of the kinfocenter indicate IRQ assignment and the pci section mentions usb also. If you are able to offer help, please be specific because I am new to this. Thanks in advance.

  2. #2
    Senior Member registered user
    Join Date
    Nov 2002
    Posts
    1,353
    You can see which usb devices are attached by issuing the following command

    cat /proc/bus/usb/devices

    In order for this to work you need the following line in /etc/fstab

    none /proc/bus/usb usbdevfs defaults 0 0

  3. #3
    Junior Member
    Join Date
    Nov 2003
    Posts
    8
    Thanks for your suggestion. However, when I type in the command (I am typing it in the command line (Alt+F2) )cat/proc/bus/usb/devices, it responds by saying "Could not run the specified command!" I also put in the line below you said to into the /etc/fstab but still no USB detection after rebooting. Does the "none" have to have a slash ( / ) in front of it? I'm new to this and trying to be patient with linux. thanks for your help

    Quote Originally Posted by aay
    You can see which usb devices are attached by issuing the following command

    cat /proc/bus/usb/devices

    In order for this to work you need the following line in /etc/fstab

    none /proc/bus/usb usbdevfs defaults 0 0

  4. #4
    Junior Member
    Join Date
    Jan 2004
    Posts
    5
    I learnt this yesterday. You need to do in addition to the fstab line a manual mount:

    mount /proc/bus/usb

    Next, you can check out the usbviewer by going through this meny Applications->Tools-> Usb view

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