Consciousness is Real, Representational, and Brain(or equivalent)-dependent

We are in the Consciousness is Real, Representational, and Brain-linked camp on this 'Hard Problem' issue.
I think that brain-linked is too weak a statement and leans too far towards Cartesian dualism.
My position is that consciousness requires a proper substrate such as a brain: brain death deletes consciousness, Alzheimer's progressively impairs consciousness, a blow to the head or falling asleep temporarily stops consciousness and so on.
I am open to there being other substrates for consciousness but not to there being an independent entity that is linked to this substrate as envisaged by Descartes.