** Changed in: unity Status: New => Confirmed -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to unity in Ubuntu. https://bugs.launchpad.net/bugs/1281806
Title: Alt-Tab switcher regularly goes into "flicker loop of death" or just hangs Status in Unity: Confirmed Status in “unity” package in Ubuntu: Confirmed Bug description: Recently when doing Alt-Tab (and Alt-`) to switch between windows, the rectangle display showing the icons for all the applications and windows will suddenly start flickering rapidly and the whole X sessions will become unresponsive to keypresses and mouse actions. Sometimes instead of flickering, the Alt-Tab display will simply fail to appear and the same unresponsive X session results. This seems to happen very frequently during the course of a day. When it happens, my only recourse is to press Ctrl-Alt-F2 to get a text console, log in, and run "killall compiz" and then "DISPLAY=:0 metacity" to kill the hung window manager and start a new one. (I tried running "DISPLAY=:0 compiz" from VT2, but that doesn't seem to start compiz in a fully functional manner.) I'm reporting this from a system with an NVidia card, but I experience the same thing on another system using an ATI "Radeon HD 7970/R9 280X" card, so I don't think it's video-driver specific. Needless to say, this makes Unity pretty hard to use effectively. ProblemType: Bug DistroRelease: Ubuntu 14.04 Package: unity 7.1.2+14.04.20140217-0ubuntu1 ProcVersionSignature: Ubuntu 3.13.0-8.28-generic 3.13.2 Uname: Linux 3.13.0-8-generic x86_64 NonfreeKernelModules: nvidia .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0' .proc.driver.nvidia.registry: Binary: "" .proc.driver.nvidia.version: NVRM version: NVIDIA UNIX x86_64 Kernel Module 304.117 Tue Nov 26 21:25:36 PST 2013 GCC version: gcc version 4.8.2 (Ubuntu/Linaro 4.8.2-14ubuntu4) .tmp.unity.support.test.0: ApportVersion: 2.13.2-0ubuntu4 Architecture: amd64 CompizPlugins: [core,composite,opengl,decor,mousepoll,grid,vpswitch,compiztoolbox,imgpng,gnomecompat,regex,move,place,resize,snap,unitymtgrabhandles,wall,animation,session,expo,workarounds,fade,ezoom,scale,unityshell] CompositorRunning: compiz CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0' CompositorUnredirectFSW: true CurrentDesktop: Unity Date: Tue Feb 18 15:24:16 2014 DistUpgraded: 2014-01-22 19:30:50,196 DEBUG enabling apt cron job DistroCodename: trusty DistroVariant: ubuntu DkmsStatus: nvidia-304-updates, 304.117, 3.11.0-15-generic, x86_64: installed nvidia-304-updates, 304.117, 3.13.0-7-generic, x86_64: installed nvidia-304-updates, 304.117, 3.13.0-8-generic, x86_64: installed EcryptfsInUse: Yes GraphicsCard: NVIDIA Corporation G73 [GeForce 7600 GT] [10de:0391] (rev a1) (prog-if 00 [VGA controller]) Subsystem: BFG Tech Device [19f1:201f] JockeyStatus: kmod:nvidia_173 - NVIDIA legacy binary driver - version 173.14.39 (Proprietary, Disabled, Not in use) kmod:nvidia_304_updates - nvidia_304_updates (Proprietary, Enabled, Not in use) kmod:nvidia_304 - NVIDIA legacy binary driver - version 304.117 (Proprietary, Disabled, Not in use) ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.13.0-8-generic root=UUID=cd444f9d-672e-4d7b-aea8-657fff0ea1f4 ro quiet splash crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M crashkernel=384M-:128M SourcePackage: unity UpgradeStatus: Upgraded to trusty on 2014-01-23 (26 days ago) dmi.bios.date: 06/26/2012 dmi.bios.vendor: Intel Corp. dmi.bios.version: WBIBX10J.86A.0336.2012.0626.0141 dmi.board.asset.tag: Base Board Asset Tag dmi.board.name: DP55WB dmi.board.vendor: Intel Corporation dmi.board.version: AAE64798-207 dmi.chassis.type: 2 dmi.modalias: dmi:bvnIntelCorp.:bvrWBIBX10J.86A.0336.2012.0626.0141:bd06/26/2012:svn:pn:pvr:rvnIntelCorporation:rnDP55WB:rvrAAE64798-207:cvn:ct2:cvr: drirc: <driconf> </driconf> version.compiz: compiz 1:0.9.11+14.04.20140217-0ubuntu1 version.ia32-libs: ia32-libs N/A version.libdrm2: libdrm2 2.4.52-1 version.libgl1-mesa-dri: libgl1-mesa-dri 10.0.1-1ubuntu2 version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A version.libgl1-mesa-glx: libgl1-mesa-glx 10.0.1-1ubuntu2 version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A version.xserver-xorg-core: xserver-xorg-core 2:1.15.0-1ubuntu6 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.8.2-1ubuntu2 version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.3.0-1ubuntu2 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 Feb 18 10:57:01 2014 xserver.configfile: /etc/X11/xorg.conf xserver.devices: input Power Button KEYBOARD, id 6 input Sleep Button KEYBOARD, id 7 input Logitech Optical USB Mouse MOUSE, id 8 input BTC USB Multimedia Keyboard KEYBOARD, id 9 input BTC USB Multimedia Keyboard KEYBOARD, id 10 xserver.errors: open /dev/dri/card0: No such file or directory open /dev/fb0: No such file or directory xserver.logfile: /var/log/Xorg.0.log xserver.outputs: xserver.version: 2:1.15.0-1ubuntu6 To manage notifications about this bug go to: https://bugs.launchpad.net/unity/+bug/1281806/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp