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[Bug 728495] [NEW] hangs machine on alt-tab or going to screen corner

 

Public bug reported:

Binary package hint: compiz

I decided to give GNOME a go on my machine (normally I use KDE).
Installed "ubuntu-desktop" and "compiz" packages, logged into "ubuntu
classic desktop" or "ubuntu default desktop" and got something more or
less working (I do not know how normal gnome session should like).

But after running few applications I wanted to switch between them by
using Alt-Tab (which I think is normal combo for this action). Whole
machine hung... I was not able to switch to VT1 or ssh login remotely
from other computer - had to reset it hard.

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: compiz 1:0.9.4-0ubuntu3
ProcVersionSignature: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Uname: Linux 2.6.38-5-generic x86_64
Architecture: amd64
CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,staticswitcher,resize,fade,unitymtgrabhandles,scale,session,unityshell]
CompositorRunning: compiz
DRM.card0.HDMI.A.1:
 status: disconnected
 enabled: disabled
 dpms: On
 modes: 
 edid-base64:
DRM.card0.VGA.1:
 status: connected
 enabled: enabled
 dpms: On
 modes: 1680x1050 1280x1024 1280x1024 1280x960 1152x864 1024x768 1024x768 1024x768 832x624 800x600 800x600 800x600 800x600 640x480 640x480 640x480 640x480 720x400
 edid-base64: AP///////wBMLR0CMDJBSAIRAQMOKxt4Ku6Vo1RMmSYPUFS/74CzAIGAgUBxTwEBAQEBAQEBITmQMGIaJ0BosDYAsQ8RAAAcAAAA/QA4Sx5REAAKICAgICAgAAAA/ABTeW5jTWFzdGVyCiAgAAAA/wBIU0hQMTA2MjAzCiAgANs=
Date: Thu Mar  3 16:13:02 2011
DistUpgraded: Fresh install
DistroCodename: natty
DistroVariant: ubuntu
DkmsStatus: vboxhost, 4.0.2, 2.6.38-5-generic, x86_64: installed
GraphicsCard:
 ATI Technologies Inc Cedar PRO [Radeon HD 5450] [1002:68f9] (prog-if 00 [VGA controller])
   Subsystem: Micro-Star International Co., Ltd. Device [1462:2120]
InstallationMedia: Kubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
InstallationMedia_: Kubuntu 10.04 "Lucid Lynx" - Release Candidate amd64 (20100419.1)
MachineType: Gigabyte Technology Co., Ltd. EP35C-DS3R
PackageArchitecture: all
ProcEnviron:
 SHELL=/bin/bash
 LANG=pl_PL.UTF-8
 LANGUAGE=pl_PL:en
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-2.6.38-5-generic root=UUID=b998ea79-ff6e-44e6-b6d4-b5eddddedde0 ro nodmraid 8250.nr_uarts=7 crashkernel=384M-2G:64M,2G-:128M quiet splash vt.handoff=7
ProcVersionSignature_: Ubuntu 2.6.38-5.32-generic 2.6.38-rc6
Renderer: Unknown
SourcePackage: compiz
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 06/18/2009
dmi.bios.vendor: Award Software International, Inc.
dmi.bios.version: F4
dmi.board.name: EP35C-DS3R
dmi.board.vendor: Gigabyte Technology Co., Ltd.
dmi.chassis.type: 3
dmi.chassis.vendor: Gigabyte Technology Co., Ltd.
dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF4:bd06/18/2009:svnGigabyteTechnologyCo.,Ltd.:pnEP35C-DS3R:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnEP35C-DS3R:rvr:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr:
dmi.product.name: EP35C-DS3R
dmi.sys.vendor: Gigabyte Technology Co., Ltd.
version.compiz: compiz 1:0.9.4-0ubuntu3
version.libdrm2: libdrm2 2.4.23-1ubuntu3
version.libgl1-mesa-glx: libgl1-mesa-glx 7.10.1~git20110215.cc1636b6-0ubuntu2
version.xserver-xorg: xserver-xorg 1:7.6~3ubuntu11
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.0-0ubuntu2
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 natty running-unity ubuntu

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https://bugs.launchpad.net/bugs/728495

Title:
  hangs machine on alt-tab or going to screen corner



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References