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[Mark Russell <mark.russell@xxxxxxxxxxxxx>]

Thanks Chris!  Good catch.  I booted into into the previous saucy kernel
(3.10.0-3) and both screens are working fine now.

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https://bugs.launchpad.net/bugs/1203540

Title:
  Multiple monitors no longer working on zenbook ux31e

Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Running up-to-date Saucy.

  Just recently (within the last couple of days)  my Asus Zenbook lost
  the ability to support two displays.

  If I boot with an external display (via mini-vga port) it will work,
  but the internal panel will not.  If I boot without the external
  display, the internal panel works fine, but hot-plugging the external
  panel does nothing.

  If I check System Settings / Displays using the external monitor, I
  only see my external monitor, although Displays reports it as "Built-
  in Display".

  ProblemType: Bug
  DistroRelease: Ubuntu 13.10
  Package: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
  ProcVersionSignature: Ubuntu 3.10.0-4.13-generic 3.10.1
  Uname: Linux 3.10.0-4-generic x86_64
  .tmp.unity.support.test.1:
   
  ApportVersion: 2.11-0ubuntu1
  Architecture: amd64
  CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
  CompositorRunning: compiz
  CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
  CompositorUnredirectFSW: true
  Date: Sun Jul 21 12:37:31 2013
  DistUpgraded: 2013-02-14 16:33:22,299 DEBUG enabling apt cron job
  DistroCodename: saucy
  DistroVariant: ubuntu
  GraphicsCard:
   Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0116] (rev 09) (prog-if 00 [VGA controller])
     Subsystem: ASUSTeK Computer Inc. Device [1043:1427]
  InstallationDate: Installed on 2012-10-20 (273 days ago)
  InstallationMedia: Ubuntu 12.10 "Quantal Quetzal" - Release amd64 (20121017.5)
  MachineType: ASUSTeK Computer Inc. UX31E
  MarkForUpload: True
  PackageArchitecture: all
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-3.10.0-4-generic root=/dev/mapper/ubuntu-root ro splash pcie_aspm=force drm.vblankoffdelay=1 i915.semaphores=1 elevator=noop vt.handoff=7
  SourcePackage: compiz
  UpgradeStatus: Upgraded to saucy on 2013-02-14 (156 days ago)
  dmi.bios.date: 12/26/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: UX31E.210
  dmi.board.asset.tag: ATN12345678901234567
  dmi.board.name: UX31E
  dmi.board.vendor: ASUSTeK Computer Inc.
  dmi.board.version: 1.0
  dmi.chassis.asset.tag: No Asset Tag
  dmi.chassis.type: 10
  dmi.chassis.vendor: ASUSTeK Computer Inc.
  dmi.chassis.version: 1.0
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX31E.210:bd12/26/2011:svnASUSTeKComputerInc.:pnUX31E:pvr1.0:rvnASUSTeKComputerInc.:rnUX31E:rvr1.0:cvnASUSTeKComputerInc.:ct10:cvr1.0:
  dmi.product.name: UX31E
  dmi.product.version: 1.0
  dmi.sys.vendor: ASUSTeK Computer Inc.
  version.compiz: compiz 1:0.9.9~daily13.04.18.1~13.04-0ubuntu1
  version.ia32-libs: ia32-libs 20090808ubuntu36
  version.libdrm2: libdrm2 2.4.45-2ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 9.1.4-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 9.1.4-0ubuntu3
  version.xserver-xorg-core: xserver-xorg-core 2:1.14.2-0ubuntu1
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.7.3-0ubuntu3.1
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.1.0-0ubuntu2.1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.21.9-0ubuntu3
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.8-0ubuntu1.1
  xserver.bootTime: Sun Jul 21 10:32:21 2013
  xserver.configfile: default
  xserver.errors: open /dev/dri/card0: No such file or directory
  xserver.logfile: /var/log/Xorg.0.log
  xserver.version: 2:1.14.2-0ubuntu1

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