Public bug reported:

Binary package hint: gnome-screensaver

Surprised if no one else has reported this, but it is an intermittent
thing.  I've been using 11.04 throughout alpha and beta for a while now,
and have even done a fresh install...

Now and then, after gnome-screensaver is enabled either by locking the
screen or automatically after the inactivity time runs out, after
unlocking the screen and coming out of gnome-screensaver, window focus
will act like it is stolen by an invisible program.  Clicking on windows
will move them to the foreground, but not make them the active window
via window title highlighting.  If I continue to alt-tab and click
around, especially after clicking on menus, the problem will get worse
to the point that I can't click anywhere or do anything on the desktop
at all, even with most keyboard shortcuts.  Alt-tab no longer works.
Menus aren't displayed.  Windows aren't movable via alt-left-click-
dragging.  However, I can do alt-F2 to pull up a run box, and I can
ctrl-alt-F# out to another tty.

While in gnome-terminal, I noticed that the cursor would only be
selected for 5 seconds or so at a time before being inactive for 5
seconds, rinse, repeat, making it difficult to type things.  Killing
gnome-screensaver puts a stop to this, but does NOT fix any other
problem with the desktop being unresponsive to most keyboard or mouse
shortcuts.  To me, that would seem to indicate a problem with gnome-
screensaver, and perhaps why killing the process doesn't completely fix
it is due to some lingering X issue that gnome-screensaver caused.  Add
to that the fact this only happens after a gnome-screensaver unlock, and
it's pretty convincing that it is the problem, though perhaps Compiz or
whatever compositing manager could be compounding the issue?

I find it hard that I'm the only one who has noticed this intermittent
issue.  It's almost like there is a stuck key suddenly, and my keyboard
is going bad, but I doubt it because nothing I hit or do will fix this
problem, yet after a restart everything is fine, while a stuck key would
immediately make the problem occur again.

Anyone else find this bug?

** Affects: gnome-screensaver (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/762058

Title:
  Ubuntu 11.04 Natty after gnome screensaver, can't click or focus

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