I'm not too sure. My inkling is that consciousness is a necessary part of the feedback loop that makes the higher order decision-making system of our brain work. If all human-level decision-making would work fine even if we weren't conscious, then why would consciousness appear in the first place? It would be unnecessary, and we could envision humans who are identical to us, act just like us, yet have the "consciousness circuit" turned off even though the will insist they are conscious, write poetry and books, muse about the meaning of existence etc. Additionally, if consciousness just appeared as a random happenstance, how do we know that a "meat computer" (a brain) would develop that phenomena "just because", while an identically functioning chip-based computer would not develop that capacity? We bring out own pro-meat bias to that assumption, because there sure as hell isn't any proof of that.