It seem it is a know ThikPad / docking problem. See: http://forum.notebookreview.com/showthread.php?t=254047
-- Thinkpad freezes when power is unplugged from docking station https://bugs.launchpad.net/bugs/271785 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
