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 -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1355562 Title: An "Unknown" display appears with no external display connected on 12.04.5 Status in HWE Next: Confirmed Status in linux package in Ubuntu: Incomplete 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 display. Steps: 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 3.13.11.4 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 ProcEnviron: TERM=xterm PATH=(custom, no user) LANG=en_US.UTF-8 SHELL=/bin/bash SourcePackage: linux-lts-trusty UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/hwe-next/+bug/1355562/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp