For example, when I attend to my vision, I can observe what colours I am experiencing in my visual field. When I attend to my olfaction, I can observe what smell sensations I have. There's nothing in physics about these fundamental sense-data. Thus it is a logical impossibility for physics to give an account of consciousness. Even when new kinds of physical measurement are defined, they are merely constructed out of existing kinds of measurement.
E.g. temperature is constructed out of things like the length of mercury in a thermometer.
Even if that were the case, the seeming would be a real seeming. No matter what seeming is going on, there is nonetheless a brute fact of conscious experience. No matter how much, or how complex, the preconscious information processing - at some point that information emerges into consciousness and at that point you have a mental sensation of some sort. Augmented physics is not the only answer Hence Chalmers is right that existing physics is inadequate. It does not follow, however, that we need to augment physics with some psychophysical laws.