But its not only "consciousness"!

The relevant truth must be:

We cant know without a function of knowing.

So i think you have to redefine the art of knowing.

Many dont understand the comoplexity and the dependency that is involved here.

Knowing is an (inter)action itself.

But its more then one action.

But first, of course, we must set the existentialism.

So lets say, if nothing interacts, nothing can register other beings. There must be movement and there must be interactions.

This does not include knowing so far. As knowing is a special way of interacting.

So what do we need to know, wether consciouss or not?

We need senses, that retrieve information out of the classic interaction. Its not clear if you need a conscious here or only a subconscious. Anyway, we can argue, that without senses, there is no consciousness. But stil we need to proof that!

Next, we need the memory system, which can save the information.

Then we need the rational system, which values the information.

And then we need the realization model, which brings the thought into the rest of the world.

So you need a lot to have a conscioussness and a unconscioussness. And there is more body function you need ...

Still its not clear how all these things work together, how they become one. But we can see the dependnecys much more clearly now ... after science walked on the last 200 years ... and now we see and know a lot more!

So, its not a hard probem of metyphysics anymore, its a normal problem of understanding the function of knowing and life at all and to realize the importance of empiricism and the whole informational/rational system we have. It all works together.

So, it brings us not very far to say, we need a conscious to register conscioussness. Its quite obvious - NOW.

So the hard problem of the past and classic metaphysic is and was, that they think, we can know something without a basic process of empiricism and knowing at all. and we cant know without a basic empiricism.

we dont need empiricisms actually to make deductions about unsensed objects, but we can only deduct if we have basic senses and all structures of knowing to recombine it to a new structure we havent sensed at all.

so i would say metaphysics is just a very old and incomplete system.

determinism, physics, systemtheory and all its dependencys, must be included into the philosophy, otherwise, we wont sense the whole thing and will make infinite and incomplete assumptions - called metaphysics!