I agree with Alex the symptoms in your video feels like software rendering. However your glxinfo and unity test info show that you definitely have hardware rendering. And that would only really affect Unity, not Unity 2D.
Would you mind also testing Gnome Classic (No Effects)? Install gnome- panel and then select it from the login screen. ** Changed in: xorg (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/927918 Title: Frequency scaling causes whole-system micro-freezes / Lags / stutters with AMD Zambezi (Bulldozer) CPU To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/927918/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs