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When we disconnect an output/offload slave set the changed bits, so a later TellChanged can do something. Then when we remove a GPU slave device, sent change notification to the protocol screen. This allows hot unplugged USB devices to disappear in clients. Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net> Signed-off-by: Dave Airlie <airlied@redhat.com>