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Somewhat related to giving joystick access to the node is making sure that the device name is accurate. My example happen when I was following the steps at: http://wiki.ros.org/joy/Tutorials/ConfiguringALinuxJoystick

For the following command in the step 01.Starting the Joy Node

$ rosparam set joy_node/dev "/dev/input/jsX"

Do not put quotes around the device name.