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[clark3934 <clark3934@xxxxxxxxx>]

I think I have this same bug.  I originally suspected that it had
something to do with chrome, since it always seemed to occur when I was
browsing the net, but after reading your report, I now think the more
likely candidate is eclipse, since I've always had eclipse open when the
bug occurs.  Perhaps the bug is caused by switching back and forth
between workspaces using Ctrl-Alt-Left and Ctrl-Alt-Right (something I
do often)?  I suspect eclipse + switching workspaces may be occasionally
breaking whatever handles window focus.

I have reproduced this bug on two machines, both of which were using
eclipse at the time.  I can usually fix the problem by closing chrome
(and any other programs, except for eclipse) using Alt-F4, but I'm not
sure if that always works.

Here's some basic information on one of the machines, a Lenovo T500
Thinkpad:

$ lsb_release -rd
Description:	Ubuntu 10.10
Release:	10.10

$ apt-cache policy xorg
xorg:
  Installed: 1:7.5+6ubuntu3
  Candidate: 1:7.5+6ubuntu3
  Version table:
 *** 1:7.5+6ubuntu3 0
        500 http://us.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages
        100 /var/lib/dpkg/status

$ apt-cache policy compiz-gnome
compiz-gnome:
  Installed: 1:0.8.6-0ubuntu9.1
  Candidate: 1:0.8.6-0ubuntu9.1
  Version table:
 *** 1:0.8.6-0ubuntu9.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:0.8.6-0ubuntu9 0
        500 http://us.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages

$ apt-cache policy compiz
compiz:
  Installed: 1:0.8.6-0ubuntu9.1
  Candidate: 1:0.8.6-0ubuntu9.1
  Version table:
 *** 1:0.8.6-0ubuntu9.1 0
        500 http://us.archive.ubuntu.com/ubuntu/ maverick-updates/main amd64 Packages
        100 /var/lib/dpkg/status
     1:0.8.6-0ubuntu9 0
        500 http://us.archive.ubuntu.com/ubuntu/ maverick/main amd64 Packages

$ uname -a
Linux clark-laptop 2.6.35-24-generic #42-Ubuntu SMP Thu Dec 2 02:41:37 UTC 2010 x86_64 GNU/Linux

I've had this bug crop up while running both the integrated (Intel) and
discrete (ATI Mobility Radeon HD 3650) graphics cards on my laptop, well
as when using my desktop's Nvidia card, so I don't think it's related to
any graphics driver.  I also don't think it's related to compiz, since
I've been able to reproduce this bug using metacity.

Let me know if I need to post any more information!

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https://bugs.launchpad.net/bugs/684503

Title:
  GUI becomes partially unresponsive