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-X, which is subscribed to xserver-xorg-video-intel in 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 _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp