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[Bug 1355562] Re: An "Unknown" display appears with no external display connected on 12.04.5


Po-Hsu Lin, thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command only once, as it will automatically gather debugging information, in a terminal:
apport-collect 1355562

** Package changed: linux-lts-trusty (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: Confirmed => Incomplete

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  An "Unknown" display appears with no external display connected on

Status in HWE Next:
Status in linux package in Ubuntu:

Bug description:
  CID: 201202-10511 Dell Inspiron 5420

  After boot to desktop, there will be an "Unknown" display work as an
  extended display on this system with 12.04.5

  The problem with this issue is that you will be able to move the
  cursor out of your screen, even open an application on the extended

  1. Install 12.04.5, boot to desktop with no external monitor connected
  2. Open the "Display" utility, check whether there is an "Unknown" display

  Expected result:
  * There should be only a "Laptop" display

  Actual result:
  * An "Unknown" display available

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: linux-image-3.13.0-32-generic 3.13.0-32.57~precise1 [modified: boot/vmlinuz-3.13.0-32-generic]
  ProcVersionSignature: Ubuntu 3.13.0-32.57~precise1-generic
  Uname: Linux 3.13.0-32-generic x86_64
  ApportVersion: 2.0.1-0ubuntu17.6
  Architecture: amd64
  Date: Mon Aug 11 22:36:12 2014
  InstallationMedia: Ubuntu 12.04.5 LTS "Precise Pangolin" - Release amd64 (20140807.1)
  MarkForUpload: True
   PATH=(custom, no user)
  SourcePackage: linux-lts-trusty
  UpgradeStatus: No upgrade log present (probably fresh install)

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