Kubuntu 12.04 uses kdm as its login manager; kdm is responsible for stopping plymouthd before it launches X. Reassigning to kdm, since this problem has not been reported when using lightdm.
This may be related to bug #982889; it appears kdm has not implemented the corresponding changes to improve reliability of plymouth handling at boot. You can check whether the fix for bug #982889 solves this for you by editing /etc/init/kdm.conf on your system and changing the 'start' rule to read: start on ((filesystem and runlevel [!06] and started dbus and plymouth-ready) or runlevel PREVLEVEL=S) ** Package changed: plymouth (Ubuntu) => kde-workspace (Ubuntu) -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1240376 Title: Plymouthd constantly using 5% of CPU time To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kde-workspace/+bug/1240376/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs