3+ monitors with discrete + Intel graphics (dual head) doesn't work

[Alex]

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

[Chris Wilson (ickle)]

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.