Ok, this issue has come back with the latest kernel in lucid. I was able to notice the difference because I did try displaying immediately after upgrading kernel to 2.6.32-30. Since I had the previous kernel installed as well, I booted back to 2.6.32-29 and don't see the problem. With the new kernel, the same symptoms are back (i.e. laptop completely hangs as soon as you connect the external display, irrespective of whether the display is on or off). I don't know what are all the changes with the new kernel, but this seems to have gone back..
I also checked if the previous work around (booting with additional kernel parameter acpi_osi =!"Windows 2006") works but unfortunately that didnt work with 2.6.32-30 kernel. I think this needs to be addressed soon since lucid is a LTS release (I plan to use lucid since I use this laptop extensively everyday). -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/512387 Title: [gm45] System Hangs on Connecting External Monitor -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs