Hello, I just installed edgy form the liveCD on my powerbook G4 and it seems that I have the same issue.
** Attachment added: "$ glxinfo" http://librarian.launchpad.net/4937590/glxinfo -- 3d rendering performance regression Dapper->Edgy with Radeon 9600 M10 https://launchpad.net/bugs/61607 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs