I suspect I'm affected by this issue too. It started after the upgrade to Ubuntu 14.04. However, directly after the upgrade the behaviour was a bit different compared to the bug description. Booting into the desktop the screen was black except for the line of launcher icons to the left. Moving the mouse over the any of the launcher icons would reveal the desktop, but as soon as I moved the mouse back onto the desktop it went black again.
After some trial and error I managed to switch to "Low graphics mode" (using unsettings). This reversed the behaviour so that it now behaves as described in this bug report. The desktop and launcher is works fine but as soon as I move the mouse cursor over any of the launcher icons and let it linger until the "tooltip" text with the name of the application is shown the desktop goes black. The desktop going black seems to be directly linked to the "tooltip" text showing. Quickly moving the cursor over the launcher icons will trigger the bug. However lingering log enough for the "tooltip" to be shown, or right-click on an icon to show its menu, will immediately cause the desktop to go black. My computer is also equipped with a Intel Corporation 4 Series Chipset Integrated Graphics Controller. -- You received this bug notification because you are a member of DX Packages, which is subscribed to unity in Ubuntu. Matching subscriptions: dx-packages https://bugs.launchpad.net/bugs/1319075 Title: Dark screen when stopping mouse on launcher icons or launching app Status in Unity: New Status in “unity” package in Ubuntu: Confirmed Bug description: Ubuntu release: 14.04 desktop unity version: 7.2.0+14.04.20140423-0ubuntu1.2 compiz version: 1:0.9.11+14.04.20140423-0ubuntu1 What expected to happen: showing running apps and/or desktop while launcher or dash is showing at the same time. What happened instead: When the mouse stop on any icons on launcher, the whole screen except unity goes dark. The same thing also happens when launching apps from launcher, dash or hotkeys, eg alt+ctrl+T -> terminal. A captured screen is attached for reference. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: unity 7.2.0+14.04.20140423-0ubuntu1.2 ProcVersionSignature: Ubuntu 3.13.0-24.47-generic 3.13.9 Uname: Linux 3.13.0-24-generic x86_64 .tmp.unity.support.test.0: ApportVersion: 2.14.1-0ubuntu3 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: Tue May 13 22:39:38 2014 DistUpgraded: 2014-05-13 21:16:28,072 DEBUG enabling apt cron job DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: vboxhost, 4.3.10, 3.11.0-20-generic, x86_64: installed vboxhost, 4.3.10, 3.13.0-24-generic, x86_64: installed GraphicsCard: Intel Corporation 4 Series Chipset Integrated Graphics Controller [8086:2e12] (rev 03) (prog-if 00 [VGA controller]) Subsystem: Lenovo Device [17aa:3047] Subsystem: Lenovo Device [17aa:3047] ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-24-generic root=UUID=c3ef9e78-03fa-466c-bc92-e6e774840d89 ro quiet splash vt.handoff=7 SourcePackage: unity UpgradeStatus: Upgraded to trusty on 2014-05-13 (0 days ago) dmi.bios.date: 12/10/2008 dmi.bios.vendor: LENOVO dmi.bios.version: 5CKT37AUS dmi.board.name: LENOVO dmi.chassis.vendor: LENOVO dmi.chassis.version: NONE dmi.modalias: dmi:bvnLENOVO:bvr5CKT37AUS:bd12/10/2008:svnLENOVO:pn7188RY4:pvrThinkCentreM58p:rvnLENOVO:rnLENOVO:rvrNONE:cvnLENOVO:ct3:cvrNONE: dmi.product.name: 7188RY4 dmi.product.version: ThinkCentre M58p dmi.sys.vendor: LENOVO version.compiz: compiz 1:0.9.11+14.04.20140423-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.1.0-4ubuntu5 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.1.0-4ubuntu5 version.xserver-xorg-core: xserver-xorg-core 2:1.15.1-0ubuntu2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu3.1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.910-0ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.10-1ubuntu2 xserver.bootTime: Tue May 13 22:31:08 2014 xserver.configfile: default xserver.devices: input Power Button KEYBOARD, id 6 input Video Bus KEYBOARD, id 7 input Power Button KEYBOARD, id 8 input AT Translated Set 2 keyboard KEYBOARD, id 9 input ImPS/2 Logitech Wheel Mouse MOUSE, id 10 xserver.errors: xserver.logfile: /var/log/Xorg.0.log xserver.outputs: product id 505 vendor SAM xserver.version: 2:1.15.1-0ubuntu2 To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1319075/+subscriptions -- Mailing list: https://launchpad.net/~dx-packages Post to : dx-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~dx-packages More help : https://help.launchpad.net/ListHelp