For me this happened only with unity. Using Gnome, it didn't happen so far.
OS: Arch Linux with Unity Lenovo T400 with Advanced Mini Dock -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to pm-utils in Ubuntu. https://bugs.launchpad.net/bugs/992004 Title: System Freezes after Undocking then Docking - HP 8740W Status in “pm-utils” package in Ubuntu: Confirmed Bug description: Hardware: HP 8740W mobile workstation with Nvidia Quadro, using Nouveau HP Docking Station (p/n: VB043AA#ABA) Operating System: Ubuntu 12.04 x86_64 Linux laptop01 3.2.0-24-generic #37-Ubuntu SMP Wed Apr 25 08:43:22 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux Problem Description: Docking this laptop while running causes the OS to freeze. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/pm-utils/+bug/992004/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
