not sure if this is related, using mergedfb with my radeon 9000 mobility results in compiz and beryl both acting weird but only on the bottom monitor, top monitor is beautiful, bottom one has artifacts and such. If this is a separate bug I will make another one, but I am going to guess these are related (I cannot get a screenshot with compiz with it's screenshot plugin... idk) attached is what my taskbar looks like on the bottom after rotating the cube with compiz (all ubuntu supported packages).
** Attachment added: "compiz tray" http://librarian.launchpad.net/6872264/Screenshot.png -- Missing textures/corruption with xorg radeon driver and MergedFB https://launchpad.net/bugs/52571 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs