There is a HOW-To here: http://gentoo-wiki.com/HOWTO_Xorg_HDTV But, it appears they are having problems. You can view the Google of this page cache here: http://72.14.203.104/search?q=cache:JhTBaxwOTN8J:gentoo-wiki.com/HOWTO_Xorg_HDTV+Linux+Xorg+HDTV&hl=en&gl=us&ct=clnk&cd=1&lr=lang_en&client=firefox-a