This bug has been fixed on my system by the lightdm 1.4.0 upload to quantal.
Thank you for the update and the fix! ** Changed in: unity-greeter (Ubuntu) Status: Confirmed => Fix Released ** Changed in: xserver-xorg-driver-radeonhd Status: New => Fix Released ** Changed in: light-themes Status: Confirmed => Fix Released ** Changed in: gnome-shell Status: New => Fix Released ** Changed in: unity-greeter Status: Confirmed => Fix Released ** Changed in: gtk Status: New => Fix Released ** Changed in: gnome-themes-standard Status: New => Fix Released -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/945450 Title: Responsiveness: LightDM in ubuntu 12.04 very slow To manage notifications about this bug go to: https://bugs.launchpad.net/gnome-shell/+bug/945450/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs