I know people who claim that they don't have qualia. I doubt that it is true, but based on their words they should be considered zombies. ))
I would like to suggest zombies of second kind. This is a person with inverted spectrum. It even could be my copy, which speaks all the same philosophical nonsense as me, but any time I see green, he sees red, but names it green. Is he possible? I could imagine such atom-exact copy of me, but with inverted spectrum. And if such second type zombies are possible, it is argument for epiphenomenalism. Now I will explain why.
Phenomenological judgments (PJ) about own consciousness, that is the ability to say something about your own consciousness, will be the same in me and my zombie of the second type.
But there are two types of PJ: quantitative (like "I have consciousness") and qualitative which describes exactly what type of qualia I experience now.
The qualitative type of PJ is impossible. I can't transfer my knowing about "green" in the words.
It means that the fact of existence of phenomenological judgments doesn't help in case of second type zombies.
So, after some upgrade, zombie argument still works as an argument for epiphenomenalism.
I would also recommend the following article with introduce "PJ" term and many problems about it (but I do not agree with it completely) "Experimental Methods for Unraveling the Mind-body Problem: The Phenomenal Judgment Approach" Victor Argonov http://philpapers.org/rec/ARGMAA-2
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We don't know how qualia are encoded in the brain. And how to distinguish a person and his copy with inverted spectrum.
I didn't say I knew which parts of the brain would differ, but to conclude therefore that it wouldn't is to confuse the map with the territory.