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The synaptics specification changes the meaning of the system bit when there is incoming data from the AUX (mouse) port, to indicate that the incoming byte is an error. This also allows to detect if the active multiplexing is not enabled correctly or has been reset. Use this as an additional check so that active multiplexing is disabled on my laptop, where it doesn't work. Keeps #19266 fixed while avoiding the long timeout on my machine. Change-Id: Ia8277e135a149cfa25a2a3022c87c3e05aacb6d5 Reviewed-on: https://review.haiku-os.org/c/haiku/+/8632 Haiku-Format: Haiku-format Bot <no-reply+haikuformatbot@haiku-os.org> Reviewed-by: Adrien Destugues <pulkomandy@pulkomandy.tk> Tested-by: Commit checker robot <no-reply+buildbot@haiku-os.org>