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Maybe your issue does not come from ROS or the OpenNi driver but from your kernel version. "Old" kernels don't have a good support of USB3.0 and you need to have at least kernel 3.4.2 to have a correct behavior (to use a kinect with USB3.0, it is needed, I don't know if it's the same with Xtion).

If you have a recent kernel, it may not be the cause of your issues.

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