FYI I just saw this bug in Xubuntu 10.04, running as a VM under Virtualbox 4.2 and OSX.
top showed 100% for Xorg process. Attaching strace to it gave the attached screenshot. After a few seconds of this scrolling up the whole graphic system froze, but I can still ssh to the VM happily, and CPU utilisation has dropped back down to zero. >From the ssh session: brian@gateway:~$ ps auxwww | grep X root 739 77.7 5.7 116344 29136 ? Ts 15:17 18:07 /usr/bin/X :1 -br -verbose -auth /var/run/gdm/auth-for-gdm-6yRsVu/database -nolisten tcp brian 1129 0.0 0.1 4108 632 ? Ss 15:18 0:00 /bin/sh /etc/xdg/xfce4/xinitrc -- /etc/X11/xinit/xserverrc brian 1325 0.0 2.8 232464 14516 ? Sl 15:18 0:00 /usr/lib/xfce4/panel-plugins/xfce4-menu-plugin socket_id 37748789 name xfce4-menu id 1 display_name Xfce Menu size 24 screen_position 1 brian 1682 0.0 0.1 7644 980 pts/4 S+ 15:41 0:00 grep --color=auto X brian@gateway:~$ ps auxwww | grep strace root 1669 0.0 0.1 4348 760 pts/1 S+ 15:37 0:00 strace -p 739 brian 1684 0.0 0.1 7640 920 pts/4 S+ 15:41 0:00 grep --color=auto strace brian@gateway:~$ uptime 15:41:41 up 23 min, 6 users, load average: 0.01, 0.42, 0.52 ** Attachment added: "Screen Shot 2013-02-15 at 15.39.52.png" https://bugs.launchpad.net/ubuntu/+source/usplash/+bug/439138/+attachment/3530238/+files/Screen%20Shot%202013-02-15%20at%2015.39.52.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/439138 Title: [karmic] Xorg 100% CPU utilization -- only after first login To manage notifications about this bug go to: https://bugs.launchpad.net/cryptsetup/+bug/439138/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs