Comment 15 for bug 700282

Actually, I see that xorg-edgers has even newer than Q4 bits, along with our new X stack.

Can you please reproduce your issue with this new stack? The PPA is available at:
https://launchpad.net/~xorg-edgers/+archive/ppa

Here's a simple way to install:
  sudo add-apt-repository ppa:xorg-edgers/ppa
  sudo apt-get update
  sudo apt-get upgrade

Then reboot your system to get to the new bits.

If you want to go back to stock Ubuntu, there is a corresponding
ppa-purge tool:
  sudo ppa-purge xorg-edgers
  sudo apt-get update
  sudo apt-get upgrade