Since the behavior exhibits itself in gnome classic without effects, and
since turning -vga std on works around the issue, it is sounding
unlikely to be mesa, and more likely to be the video driver itself
(-cirrus, or potentially the kernel).

Does booting the quantal kernel in the raring vm (without using the -vga
std workaround) also work around the problem?

** Changed in: mesa (Ubuntu)
       Status: New => Invalid

** Changed in: xserver-xorg-video-cirrus (Ubuntu)
       Status: New => Incomplete

** Package changed: mesa (Ubuntu) => linux (Ubuntu)

** Changed in: linux (Ubuntu)
       Status: Invalid => Incomplete

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https://bugs.launchpad.net/bugs/1080674

Title:
  [QEMU] Corrupted desktop screen for raring desktop installation in
  QEMU guest (Cirrus graphics)

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