Comment 4 for bug 324854

http://cgit.freedesktop.org/mesa/mesa/commit/?id=3ee21f30cda27e0ee1357f930163526622ba9434

and

http://cgit.freedesktop.org/mesa/mesa/commit/?id=24ff169486e315671c09cd8a57a311a935ccfff5

Seem like relevant upstream changes to expose more FBConfigs.

I haven't had time to try these out, to see if they "just work", with compiz picking the right visual -> correct texture format being selected etc..

As an alternative for Jaunty (if it were necessary), I've got a compiz patch (ABI breaking unfortunately) which avoids the issue by tracking the 24bit colour depth X pixmaps, and avoids using the alpha channel on their mapped textures.