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[Bug 1002641] Re: after upgrade to 12.04 amd64 Gnome Classic not properly draw second screen

 

I'm having almost the same problem. I'm running a 32 bit fresh install of 12.04, with nvidia drivers and Unity.
Screen1 is white and quite unusable when configured as a separate X-screen.
I have tried with both compiz and metacity.

Compiz:
   The windows (which have been started with commands like "DISPLAY=:0.1 gnome-terminal" from screen1) have no window decoration. It is not possible to get keyboard focus on them, but it is possible to click on them and navigate with the mouse. Since they have no window decoration, it is not possible to move them. It is also not possible to run "DISPLAY=:0.1 wmctrl -l" from screen1.

Metacity:
  The background on screen1 is still white, but with metacity things work a little bit better. The windows have decoration and can therefore be moved. It is possible to select them so that they get keyboard focus. In this case, "DISPLAY=:0.1 wmctrl -l" does in fact work.

I have also tried with both lightdm and gdm. When using lightdm and
compiz, the mouse cursor is an X as described above. With all the other
combinations, the mouse cursor is normal. Switching between gdm and
lightdm does not seem to have other visible effects.

All in all, this is a pretty annoying thing, but I don't know X well
enough to be able to debug this on my own.

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https://bugs.launchpad.net/bugs/1002641

Title:
  after upgrade to 12.04 amd64 Gnome Classic not properly draw second
  screen

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