Each device has a quiet flag associated with it.
A device is
verbose by default when it is created but may be quieted to prevent
the device identification string to be printed during probe.
To quiet a device, call
device_quiet (,);
to re-enable to probe message (to make the message appear again, for
example after a
device_detach9)
call
device_verbose (.);
To test to see if a device is quieted, call
device_is_quiet (.);
