The bug seems to be in the nvidia driver. It still supports its own Twinview method of setting up multihead, but the log indicates that the other head failed to load:
(EE) NVIDIA(1): Failed to initialize the NVIDIA graphics device PCI:3:0:0. (EE) NVIDIA(1): Please see the COMMON PROBLEMS section in the README for (EE) NVIDIA(1): additional information. (EE) NVIDIA(1): Failed to initialize the NVIDIA graphics device! ** Changed in: linux-restricted-modules-2.6.24 (Ubuntu) Sourcepackagename: xorg => linux-restricted-modules-2.6.24 -- 8.04 - X with NVidia drivers does not detect screens or second graphics card https://bugs.launchpad.net/bugs/223875 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