Comment 13 for bug 806636

This problem also existed in Natty, but only when using the proprietary FGLX driver and a theme other than Radiance or Ambiance. It's as if the window decorations of unmaximized windows are 'frozen', unchanging unless forced to with a window resize.

When using the Radiance or Ambiance theme, the window decorations would update fine, unless the window was not in focus, in which case mouse-overing the window controls would not highlight them and the window title would not change until the window was again in focus.

The problem existed for Natty in both compiz-decorator and gtk-window-decorator, but not metacity when using the classic desktop. In addition, this problem was solved for me by downgrading to a pre-Unity compiz version, leading me to believe the problem is somewhere inside compiz itself.

Now, the problem isn't just in the proprietary driver and even occurs when using the default opensource one present in Oneiric. Has that driver changed at all or has Compiz changed in the way it interacts with it? Could this be a kernel or xorg issue?

It's a major issue for most people using ATI graphics for the window decorations not to work as expected.