Public bug reported: I have configured my display setup to automatically disable the internal laptop display when an external monitor is connected via the displayport.
In this configuration, when connecting a Dell developer laptop (XPS 9343) with a QHD (3200x1800) resolution to an external FHD (1920x1200) screen, the resolution and scaling updates correctly, but the desktop background stops redrawing properly. Apart from the top-left corner, the desktop area is not updated and any window moved over it will leave ghost images behind (see attached screenshot). It appears as if the physical size of the internal laptop display is somehow being used for the external monitor, and any region of the desktop outside this area is not refreshed. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: unity 7.2.5+14.04.20150603-0ubuntu1 ProcVersionSignature: Ubuntu 3.19.0-31.36~14.04.1-generic 3.19.8-ckt7 Uname: Linux 3.19.0-31-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.14.1-0ubuntu3.16 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 CurrentDesktop: Unity Date: Sat Oct 17 15:42:53 2015 DistUpgraded: Fresh install DistributionChannelDescriptor: # This is a distribution channel descriptor # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor canonical-oem-somerville-trusty-amd64-20140620-0 DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: vboxhost, 5.0.6, 3.19.0-30-generic, x86_64: installed vboxhost, 5.0.6, 3.19.0-31-generic, x86_64: installed EcryptfsInUse: Yes GraphicsCard: Intel Corporation Broadwell-U Integrated Graphics [8086:1616] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Dell Device [1028:0665] InstallationDate: Installed on 2015-08-06 (72 days ago) InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20140620-04:25 MachineType: Dell Inc. XPS 13 9343 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-31-generic root=UUID=a25c6bbb-2787-44a4-a7f3-e90492f995db ro quiet splash pcie_aspm=force radeon.modeset=0 nouveau.modeset=0 "acpi_osi=Windows 2013" vt.handoff=7 SourcePackage: unity UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/14/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 0310JH dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA05:bd07/14/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9343 dmi.sys.vendor: Dell Inc. version.compiz: compiz 1:0.9.11.3+14.04.20150313-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.60-2~ubuntu14.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri N/A version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core N/A version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A xserver.bootTime: Sat Oct 17 09:54:36 2015 xserver.configfile: default xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 61463 vendor DEL xserver.version: 2:1.17.1-0ubuntu3.1~trusty1 ** Affects: unity (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 third-party-packages trusty ubuntu ** Attachment added: "Desktop screenshot showing desktop corruption" https://bugs.launchpad.net/bugs/1507191/+attachment/4498205/+files/Workspace%201_004.png -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1507191 Title: Switching from internal QHD to external FullHD screen causes desktop redraw issues To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/unity/+bug/1507191/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
