Thank you for reporting this bug to Ubuntu. Ubuntu 15.04 (vivid) reached end-of-life on February 4, 2016.
See this document for currently supported Ubuntu releases: https://wiki.ubuntu.com/Releases We appreciate that this bug may be old and you might not be interested in discussing it any more. But if you are then please upgrade to the latest Ubuntu version and re-test. If you then find the bug is still present in the newer Ubuntu version, please add a comment here telling us which new version it is in and change the bug status to Confirmed. ** Changed in: mutter (Ubuntu) Status: New => Won't Fix -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to mutter in Ubuntu. https://bugs.launchpad.net/bugs/1469173 Title: Bottom portion of screen is black/blank with 4 monitor display Status in mutter package in Ubuntu: Won't Fix Bug description: I have 4 monitors in a single X display using NVidia Base Mosaic. Using Ubuntu GNOME I have two landscape monitors stacked with a portrait on either side. If the portrait monitors are configured such that the BOTTOM of their screens align with the BOTTOM landscape monitor, both portraits and the bottom landscape monitor will not display anything below the lower 1/2 of the screen. I can move the pointer to the lower portion of the screen, and see the pointer there, but if I try and drag a window it acts as if there's an artificial bottom. It seems that the size of the non-displayable area is the same as the distance between the top of the portrait screens and the top of the landscape screens. (I attached a screenshot of the displays configuration. The problem is when 3 and 4 are bottom aligned) If the portrait monitors are configured such that the TOP of their screens align with the TOP landscape monitor, everything works as expected. I do not believe this is an explicit X server issue because if I take my Gnome monitors.xml and have lightdm use that, everything works as expected. I believe it is related to the Gnome display manager. It is as if something that is deciding what the visible display area is has some bad math with this layout. This was all functioning properly under 14.04. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: xorg 1:7.7+7ubuntu4 ProcVersionSignature: Ubuntu 3.19.0-21.21-generic 3.19.8 Uname: Linux 3.19.0-21-generic x86_64 NonfreeKernelModules: nvidia .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 340.76 Thu Jan 22 12:11:08 PST 2015 GCC version: gcc version 4.9.2 (Ubuntu 4.9.2-10ubuntu13) ApportVersion: 2.17.2-0ubuntu1.1 Architecture: amd64 CurrentDesktop: GNOME Date: Fri Jun 26 08:12:55 2015 DistUpgraded: 2015-06-25 11:27:46,831 DEBUG enabling apt cron job DistroCodename: vivid DistroVariant: ubuntu DkmsStatus: bbswitch, 0.7, 3.13.0-39-generic, x86_64: installed bbswitch, 0.7, 3.16.0-41-generic, x86_64: installed bbswitch, 0.7, 3.19.0-21-generic, x86_64: installed nvidia-340, 340.76, 3.19.0-21-generic, x86_64: installed GraphicsCard: NVIDIA Corporation GM107GL [Quadro K620] [10de:13bb] (rev a2) (prog-if 00 [VGA controller]) Subsystem: NVIDIA Corporation Device [10de:1098] NVIDIA Corporation GM107GL [Quadro K620] [10de:13bb] (rev a2) (prog-if 00 [VGA controller]) Subsystem: NVIDIA Corporation Device [10de:1098] MachineType: Hewlett-Packard HP Z600 Workstation ProcKernelCmdLine: root=UUID=fc29ed89-f722-473a-b519-7af62918be40 ro quiet splash SourcePackage: xorg Symptom: display UpgradeStatus: Upgraded to vivid on 2015-06-25 (0 days ago) dmi.bios.date: 07/09/2010 dmi.bios.vendor: Hewlett-Packard dmi.bios.version: 786G4 v03.10 dmi.board.name: 0AE8h dmi.board.vendor: Hewlett-Packard dmi.board.version: C dmi.chassis.type: 6 dmi.chassis.vendor: Hewlett-Packard dmi.modalias: dmi:bvnHewlett-Packard:bvr786G4v03.10:bd07/09/2010:svnHewlett-Packard:pnHPZ600Workstation:pvr:rvnHewlett-Packard:rn0AE8h:rvrC:cvnHewlett-Packard:ct6:cvr: dmi.product.name: HP Z600 Workstation dmi.sys.vendor: Hewlett-Packard version.compiz: compiz N/A version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.60-2 version.libgl1-mesa-dri: libgl1-mesa-dri 10.5.2-0ubuntu1 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.5.2-0ubuntu1 version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2 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: Thu Jun 25 12:36:38 2015 xserver.configfile: /etc/X11/xorg.conf xserver.devices: input Power Button KEYBOARD, id 6 input Power Button KEYBOARD, id 7 input Microsoft Microsoft Basic Optical Mouse v2.0 MOUSE, id 8 input Lite-On Technology Corp. HP Basic USB Keyboard KEYBOARD, id 9 input HP WMI hotkeys KEYBOARD, id 10 xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.17.1-0ubuntu3 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/mutter/+bug/1469173/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp