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 Desktop Packages, 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 Status in “xserver-xorg-video-intel” package in Ubuntu: Invalid Bug description: See here: http://askubuntu.com/questions/171222/3-monitors-nvidia- intel-graphics/196914#196914 Seems impossible currently to use Intel integrated graphics (Sandybridge in my case) alongside discrete card, regardless of whether BIOS is configured to allow this. Integrated graphics do not show up as VGA compatible in lspci when discrete card is connected, leading me to believe this may be a low-level issue -- but works fine on same hardware configuration in Windows. ProblemType: Bug DistroRelease: Ubuntu 12.04 Package: xorg 1:7.6+12ubuntu1 ProcVersionSignature: Ubuntu 3.2.0-32.51-generic 3.2.30 Uname: Linux 3.2.0-32-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.0.1-0ubuntu14 Architecture: amd64 CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell] CompositorRunning: compiz Date: Sun Nov 4 10:36:12 2012 DistUpgraded: Fresh install DistroCodename: precise DistroVariant: ubuntu DkmsStatus: virtualbox, 4.1.12, 3.2.0-29-generic, x86_64: installed virtualbox, 4.1.12, 3.2.0-30-generic, x86_64: installed virtualbox, 4.1.12, 3.2.0-31-generic, x86_64: installed virtualbox, 4.1.12, 3.2.0-32-generic, x86_64: installed ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0112] (rev 09) (prog-if 00 [VGA controller]) Subsystem: ASRock Incorporation Device [1849:0112] InstallationMedia: Ubuntu 12.04.1 LTS "Precise Pangolin" - Release amd64 (20120823.1) MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M. ProcEnviron: LANGUAGE=en_CA:en PATH=(custom, no user) LANG=en_CA.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.2.0-32-generic root=UUID=1533dd09-48da-4d4c-9233-d2582e1aa4d1 ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/24/2012 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: P2.20 dmi.board.name: Z68M-ITX/HT dmi.board.vendor: ASRock dmi.chassis.asset.tag: To Be Filled By O.E.M. dmi.chassis.type: 3 dmi.chassis.vendor: To Be Filled By O.E.M. dmi.chassis.version: To Be Filled By O.E.M. dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP2.20:bd04/24/2012:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnZ68M-ITX/HT:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.: dmi.product.name: To Be Filled By O.E.M. dmi.product.version: To Be Filled By O.E.M. dmi.sys.vendor: To Be Filled By O.E.M. version.compiz: compiz 1:0.9.7.8-0ubuntu1.4 version.ia32-libs: ia32-libs 20090808ubuntu36 version.libdrm2: libdrm2 2.4.39+git1210291303.e32fff~gd~p version.libgl1-mesa-dri: libgl1-mesa-dri 9.1~git1210191809.c2e37b~gd~p version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 9.1~git1210191809.c2e37b~gd~p version.xserver-xorg-core: xserver-xorg-core 2:1.11.4-0ubuntu10.8 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.0-0ubuntu1.2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.99.99+git1211031411.b2807b~gd~p version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.20.12+git1211021659.e62b0c~gd~p version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.3+git1211020926.20995b~gd~p 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/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp