It seems the situation regarding closed caption and hdmi is probably best described as a clusterf**k. If you had a setup with a composite/S-Video connection and relied on closed caption to be available, you are in a for a big surprise when switching to HDTV.
Here is a link from TEITAC:http://teitac.org/mailarchives/mail_...d=2834&listid=
"So clearly the authors of the HDMI spec thought the DVD players would decode
captions - they even mistakenly believed that they were required to do so.
Many of the members of the HDMI consortium are also members of CEA ...
So, here we have a situation where the right hand didn't know what the left
hand was doing - and deaf consumers and others who rely on closed captioning
are faced with acceptance of .... a lower quality image (composite video
and last generation DVDs) ..."