I believe that this was indeed fixed in Jaunty, but I am almost certain that I have been experiencing the same bug. It was so bad that I switched to XFCE until I just tonight figured out the correlation between having emacs open and the freezing. Turning off assistive technologies appears to have cleared it up. For me it was alt-tabbing, invoking gnome-do, or hitting the system tray area.
I believe that this was indeed fixed in Jaunty, but I am almost certain that I have been experiencing the same bug. It was so bad that I switched to XFCE until I just tonight figured out the correlation between having emacs open and the freezing. Turning off assistive technologies appears to have cleared it up. For me it was alt-tabbing, invoking gnome-do, or hitting the system tray area.
I filed a bug against it here:
https:/ /bugs.launchpad .net/ubuntu/ +source/ xserver- xorg-video- intel/+ bug/576646