You have to manually configure X in this case to use both devices simultaneously (so long as the BIOS doesn't hide the igfx when a dgpu is plugged in). In raring, though this should start to work semi- automatically using nouveau with PRIME.
** Changed in: xserver-xorg-video-intel (Ubuntu) Status: New => Invalid -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1074941 Title: 3+ monitors with discrete + Intel graphics (dual head) doesn't work To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/1074941/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs