Comment 13 for bug 184686

ihavenoname, If you can still move the mouse, then it's an Xorg freeze. Please attach a copy of your Xorg.0.log and/or Xorg.0.log.old (they may contain a backtrace which would be useful in debugging this further.)

Fwiw, I'm considering switching greedy on by default for all Intel chipsets as many have reported it improves things for them; so far, you are the only person reporting that it causes additional problems, so it would be nice to get that sorted out before Hardy releases.