I don't know why I didn't see the bug #133371 when I searched for... But in this bug it is said that the Radeon don't work with Compiz at all whereas I'm almost sure that it worked for me before all the updates and some people in the Ubuntu-fr forum seem to confirm it.
-- Compiz Fusion doesn't work with ATI Radeon 9550 https://bugs.launchpad.net/bugs/146669 You received this bug notification because you are a member of Ubuntu Bugs, which is the bug contact for Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs