I have tested with a fresh install of Oneiric on a intel core i3 system. I cannot reproduce the issue mentioned.
My internal display is resolution is 1280x800 while my external monitor is 1280x1024. The gnome control panel offers the following resolutions for the external monitor: - 1024x768 - 800x600 I can run in dual monitor config with my internal resolution maxed at 1280x800 and any of the resolutions above for the external monitor. The control panel used to propose the option to choose the maximum resolution of my external monitor (1280x1024) but it doesn't do that anymore. It has been like that for a month or so. Previously, if I had tried to use the max resolution of the external monitor, things would become very slow as if running in software. So I suppose the control panel is more clever now and only offers resolution that can be supported. Please, test with a fresh install and a recent version of Oneiric. ** Changed in: unity Status: Triaged => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/808677 Title: Failed to activate external monitor (dual monitor mode) To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/808677/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs