Good news on the Radeon HD front..After r42931 (nightly images only at r42930 right now) Radeon HD 4xxx cards are beginning to show life.
http://twitpic.com/770mjiFor those of you not keeping count, that means currently the following cards are working with
extended mode setting in the latest radeon_hd code: Radeon HD 2xxx - working well with a few reports of non-functionality. Radeon HD 3xxx - working well, no reports of issues Radeon HD 4xxx - working as of this morning. (needs testing!)The following cards still need some love and have a really high chance (95%+?) of not working:
Radeon HD 5xxx Radeon HD 6xxxKeep in mind that edge cases of 2xxx - 4xxx cards not working may exist. If you find them... open a bug report on dev.haiku-os.org (after checking to make sure your not opening a duplicate case
Good Luck! -- Alex