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Thread: Scanner - permission to rw usb port

  1. #1
    Join Date
    Feb 2007
    Beans
    17

    Question Scanner - permission to rw usb port

    I have an Epson all-in-one printer-scanner so I have installed iscan. However, iscan does not work because it says it cannot authenticate (i.e. get permission) to read-write to /dev/bus/usb/001/xxx where xxx is a number that changes every time I switch on the scanner. I can solve this by doing sudo chmod 777 /dev/bus/usb/001/xxx but i have to look up the number (i.e. xxx) of the file that has appeared in /dev/bus/usb/001/ every time the scanner is switched on. How can I make it give me permission to rw automatically? It does not seem to be in the user management dialogue to give me the rights.

    Can anyone tell me how. Is there a config file somewhere for usb devices that sets up the default permissions? Why don't other people have this problem? (I am running karmic but I had the same problem in jaunty - so have posted it here.)

    Thanks

  2. #2
    Join Date
    Nov 2005
    Location
    Bordeaux, France
    Beans
    11,297
    Distro
    Ubuntu 12.04 Precise Pangolin

    Re: Scanner - permission to rw usb port

    Paste the output of

    Code:
    ls -l /dev/bus/usb/001/xxx
    before you chmod it 777.
    「明後日の夕方には帰ってるからね。」


  3. #3
    Join Date
    Feb 2007
    Beans
    17

    Re: Scanner - permission to rw usb port

    The result is

    root@chris-desktop:/dev/bus/usb/001# ls -l
    total 0
    crwxrwxrwx 1 root root 189, 0 2009-10-04 15:34 001
    crwxrwxrwx 1 root root 189, 1 2009-10-04 15:34 002
    crw-rw-r-- 1 root root 189, 10 2009-10-04 16:58 011

    011 is the file that appears when the scanner is switched on.

    Does this help?
    Thanks

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