I have a new Brother MFC and had permission issues and managed to solve them by changing GROUP="scanner" to GROUP="lp" in the relevant udev rule as my user is in the lp group but not in the scanner group and I didn't want to log out and in. However /dev/usb/lp0 was lp before and it still is. So it must be something else, but what?
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1 Answer
You have probably changed the rule pertaining to the /dev/bus/usb/<busnum>/<devnum> device nodes. Those are generic USB device nodes, which can be used from user-space programs to communicate with any USB device (even those that do not have any specific driver).
