** Description changed:

  Dual-head display (Matrox G450, Xinerama, 1280x1024 on each screen).
  The problem appeared immediately after migrating from drapper 6.06 to edgy 
6.10
- When moving a window the window fast enough on the secondary screen, the 
"trailing" effect behind the window is not erased from the desktop and leaves 
random patterns behind (on the desktop background). When moving the window very 
slowly, the problem does not happen.
+ When moving a window fast enough on the secondary screen, the "trailing" 
effect behind the window is not erased from the desktop and leaves random 
patterns behind (on the desktop background). When moving the window very 
slowly, the problem does not happen.
  Displaying then closing any window on the garbled desktop repaints the 
desktop background.
  A much less frequent form of the problem is that once in a while, a graphical 
object is painted garbled in an application window (for instance, the Google 
logo in Firefox). In this case, the garbled spot is exactly the rectangle that 
should have contained the graphical object.

** Description changed:

  Dual-head display (Matrox G450, Xinerama, 1280x1024 on each screen).
  The problem appeared immediately after migrating from drapper 6.06 to edgy 
6.10
  When moving a window fast enough on the secondary screen, the "trailing" 
effect behind the window is not erased from the desktop and leaves random 
patterns behind (on the desktop background). When moving the window very 
slowly, the problem does not happen.
- Displaying then closing any window on the garbled desktop repaints the 
desktop background.
+ Displaying then closing any window, or moving a window very slowly on the 
garbled desktop properly repaints the desktop background. 
+ When moving a window over another window, the underneath window always 
repaints properly.
+ This never happens on the primary screen. 
  A much less frequent form of the problem is that once in a while, a graphical 
object is painted garbled in an application window (for instance, the Google 
logo in Firefox). In this case, the garbled spot is exactly the rectangle that 
should have contained the graphical object.

** Description changed:

  Dual-head display (Matrox G450, Xinerama, 1280x1024 on each screen).
  The problem appeared immediately after migrating from drapper 6.06 to edgy 
6.10
  When moving a window fast enough on the secondary screen, the "trailing" 
effect behind the window is not erased from the desktop and leaves random 
patterns behind (on the desktop background). When moving the window very 
slowly, the problem does not happen.
  Displaying then closing any window, or moving a window very slowly on the 
garbled desktop properly repaints the desktop background. 
- When moving a window over another window, the underneath window always 
repaints properly.
+ When moving a window over another window, the underneath window always 
repaints properly (i.e. doesn't endup garbled).
  This never happens on the primary screen. 
  A much less frequent form of the problem is that once in a while, a graphical 
object is painted garbled in an application window (for instance, the Google 
logo in Firefox). In this case, the garbled spot is exactly the rectangle that 
should have contained the graphical object.

-- 
Randomly garbled display, secondary screen, dual-head
https://launchpad.net/bugs/68968

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