Full Idea
My doubts about functionalist accounts of qualia are based on the much discussed arguments from qualia inversions, and from epistemic considerations.
Clarification
'Inversions' are seeing marigold where others see violet; 'epistemic' means to do with knowledge
Gist of Idea
Knowledge and inversion make functionalism about qualia doubtful
Source
Jaegwon Kim (Mind in a Physical World [1998], §4 p.102)
Book Reference
Kim,Jaegwon: 'Mind in the Physical World' [MIT 2000], p.102
A Reaction
With a colour inversion experience changes but function doesn't. But maybe function does change if you ask the right questions. 'Is this a warm colour?' It certainly strikes me that qualia contain useful (epistemic) information.