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For keyboards, scroll events are reported by the kernel as EV_REL class events of REL_WHEEL type. If, during probing, the device is found to support wheel events, make sure it is set up as a pointing device, even if it doesn't have buttons or doesn't report motion along the X and Y axis so that the scroll events can be mapped to mouse wheel buttons (usually buttons 4 and 5). Signed-off-by: Peter Hutterer <peter.hutterer@redhat.com>