this is happening to me in a lenovo t61 in kubuntu natty when using nouveau drivers. no problem on nvidia drivers though. somewhere I saw that actually this was a problem in X11 and other free drivers were also suffering same symptoms.
this is a bit annoying, hopefully it will be fixed soon... ** Changed in: xserver-xorg-video-intel (Ubuntu) Status: Expired => New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/753216 Title: [arrandale] Computer hangs when trying to sleep after external monitor is connected or disconnected To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/753216/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs