unity quits on alt-tab

[Ondrej Certik]

When pressing alt-tab, the unity sometimes quits (looks like some segfault). It started happening
maybe a month ago, and it now happens probably at least once a day.

It helps to go to the text terminal (ctrl-alt-f2), and type "unity --reset", then go back (ctrl-alt-f7).
Then typing alt-tab segfaults again, so before doing anything, the computer needs to be restarted.

Unfortunately I don't know how to reproduce it, apart from just working until it fails.

Any ideas how to fix this? This bug makes Ubuntu pretty much unusable.

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: unity 4.28.0-0ubuntu2
ProcVersionSignature: Ubuntu 3.0.0-16.28-generic 3.0.17
Uname: Linux 3.0.0-16-generic x86_64
.tmp.unity.support.test.0:

ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
Date: Mon Feb 13 21:48:16 2012
DistUpgraded: Log time: 2011-10-14 10:32:44.669781
DistroCodename: oneiric
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Core Processor Integrated Graphics Controller [8086:0046] (rev 02) (prog-if 00 [VGA controller])
   Subsystem: Acer Incorporated [ALI] Device [1025:040e]
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
MachineType: Acer Aspire 1830T
ProcEnviron:
 PATH=(custom, user)
 LANG=en_US.UTF-8
 SHELL=/bin/bash
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-16-generic root=UUID=c1cc0765-e24e-455d-9397-00714eded174 ro quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: Upgraded to oneiric on 2011-10-14 (122 days ago)
dmi.bios.date: 09/28/2010
dmi.bios.vendor: INSYDE
dmi.bios.version: V1.20
dmi.board.asset.tag: Base Board Asset Tag
dmi.board.name: JV10_CS
dmi.board.vendor: Intel Corp.
dmi.board.version: Base Board Version
dmi.chassis.type: 1
dmi.chassis.vendor: Chassis Manufacturer
dmi.chassis.version: Chassis Version
dmi.modalias: dmi:bvnINSYDE:bvrV1.20:bd09/28/2010:svnAcer:pnAspire1830T:pvrV1.20:rvnIntelCorp.:rnJV10_CS:rvrBaseBoardVersion:cvnChassisManufacturer:ct1:cvrChassisVersion:
dmi.product.name: Aspire 1830T
dmi.product.version: V1.20
dmi.sys.vendor: Acer
version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu6
version.ia32-libs: ia32-libs 20090808ubuntu26
version.libdrm2: libdrm2 2.4.26-1ubuntu1
version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7.1
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2.1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

[Sam_ (and-sam)]

Possibly dupe of bug 916879

[Ondrej Certik (ondrej-certik)]

Yes, it is definitely a duplicate for it. Here is a workaround this bug:

Install "compizconfig-settings-manager", run "ccsm", go to "Ubuntu Unity Plugin" -> Switcher and disable all key bindings.
Go to the main screen and enable "Static Application Switcher". (If you do it the other way around, you will get segfaults.)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.