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[dronus <362359@xxxxxxxxxxxxxxxxxx>]

Also happens to me on 12.04 in Gnome Classic Mode from time to time.
Happens to plugged devices or integrated touchpads too.

Using the context menu click and left clicks in some wild fashion may
release the stuck focus, but no clear picture what event exactly
releases the stuck focus.

Triggering of the problem maybe involves wheel scrolling events or
conetxt menu usage in some unusual combination.

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https://bugs.launchpad.net/bugs/362359

Title:
  Focus gets stuck to a window - impossible to select other windows

Status in “xorg-server” package in Ubuntu:
  Fix Released

Bug description:
  Alright, terribly annoying bug that gets me to reboot several times a
  day, but very hard to understand how to trigger it.

  What happens: after some time of usage, you get "stuck" in a window. Idem est, you can not select another window. 
  You can still click, select and drag in the window that has the focus, but clicking on other windows, or on the panel, just doesn't work.

  Notes:
  - With window I don't mean "application window". For example it can only be the page view in firefox, and  you won't be able to click the buttons or the URL field. It can also be the main text window in xchat, and you wont be able to click in the user list or to change the chatroom.
  - The click seems to be grabbed by the window having the focus, even if you click outside of it. For example, using xchat, if the main text window has focus, clicking and dragging in the user list will actually select text in the main text window.
  - Using xev, it seems that clics do not get passed to the correct window at all (nothing received)
  - I have no idea what triggers this as sometimes it will trigger alone - pc works, I leave it for an hour, I come back, the problem is triggered
  - Curious effect now: dragging and dropping to another window gives focus to the window, and seems to be the only way to do so. For example if in firefox the main page view window has the focus and I cant click the buttons, drag and dropping text to the buttons gives the focus to the buttons, and I can't clic the page view window anymore. Drag and dropping a button to the page view window gives it its focus back....

  
  Additional info: 
  * Compiz disabled
  * Intel graphic card
  * Ubuntu jaunty - latest patches
  * Using a laptop, with an USB mouse

  HAL, xserver, I have no idea where to file this bug into. I hope it will be fixed before the release, it is really terribly annoying :s 
  Please tell me if there is any other detail I can provide.

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