Partially resolved after updating bumblebee.
Resolved after system update.

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https://bugs.launchpad.net/bugs/1176033

Title:
  Only single monitor active in dual-monitor setup

Status in “xorg” package in Ubuntu:
  New

Bug description:
  Hello,
  I recently upgraded my Lenovo IdeaPad Y580 from Ubuntu 12.10 to 13.04.
  On 12.10 I installed bumblebee in order to properly use Optimus (GTX 660M).

  Now, if I boot w/o the external monitor connected, I get picture on my
  laptop's screen. When connecting the external monitor after boot, it
  does not show anything.

  If I boot with the external monitor connected, the internal monitor
  goes blank once Ubuntu has finished loading.

  I have tried various display configurations using the Settings > Displays.
  It appears that the other screen is considered to exist when in dual-display 
settings, since I can drag my mouse and windows to the other monitor.
  In addition, if the external display is active and I go to one of the tty 
terminals, it is displayed on the laptop's internal display. 
  I will be happy to provide more information, but keep in mind that I consider 
myself as an Ubuntu-novice.

  ProblemType: Bug
  DistroRelease: Ubuntu 13.04
  Package: xorg 1:7.7+1ubuntu4
  ProcVersionSignature: Ubuntu 3.8.0-19.30-generic 3.8.8
  Uname: Linux 3.8.0-19-generic x86_64
  .tmp.unity.support.test.0:
   
  ApportVersion: 2.9.2-0ubuntu8
  Architecture: amd64
  CompizPlugins: 
[core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Fri May  3 16:09:04 2013
  DistUpgraded: 2013-05-02 15:08:06,644 DEBUG enabling apt cron job
  DistroCodename: raring
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes
  GraphicsCard:
   Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] 
(rev 09) (prog-if 00 [VGA controller])
     Subsystem: Lenovo Device [17aa:3977]
   NVIDIA Corporation GK107M [GeForce GTX 660M] [10de:0fd4] (rev ff) (prog-if 
ff)
  InstallationDate: Installed on 2013-01-20 (102 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: LENOVO 20132
  MarkForUpload: True
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   XDG_RUNTIME_DIR=<set>
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.8.0-19-generic.efi.signed 
root=UUID=ead6a959-e8a5-49ab-99c8-ba91596dbaa7 ro acpi=force 
crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
  SourcePackage: xorg
  UpgradeStatus: Upgraded to raring on 2013-05-02 (1 days ago)
  dmi.bios.date: 10/11/2012
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 5DCN90WW(V8.01)
  dmi.board.asset.tag: No Asset Tag
  dmi.board.name: INVALID
  dmi.board.vendor: LENOVO
  dmi.board.version: 31900003WIN8 STD MLT
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Lenovo IdeaPad Y580
  dmi.modalias: 
dmi:bvnLENOVO:bvr5DCN90WW(V8.01):bd10/11/2012:svnLENOVO:pn20132:pvrLenovoIdeaPadY580:rvnLENOVO:rnINVALID:rvr31900003WIN8STDMLT:cvnLENOVO:ct10:cvrLenovoIdeaPadY580:
  dmi.product.name: 20132
  dmi.product.version: Lenovo IdeaPad Y580
  dmi.sys.vendor: LENOVO
  version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.43-0ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.1-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.1-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.13.3-0ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu2b2
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.6-0ubuntu4
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 
1:1.0.7-0ubuntu1
  xserver.bootTime: Fri May  3 15:42:39 2013
  xserver.configfile: default
  xserver.errors:
   
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.13.3-0ubuntu6
  xserver.video_driver: intel

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