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[dp <496890@xxxxxxxxxxxxxxxxxx>]

I currently do not have linux installed on my macbook. I did however try
with the natty live cd. The problem appears to have been partially
solved, but let me elaborate:

- Hardware is the same as with my original setup (Same Macbook, same external display)
- Software is different: Previously I used KDE (Desktop effects explicitly enavbled), on the Live-CD I used Unity (Desktop effects ??? enabled - presumably yes)

When using only the internal display, everything is fine. When plug in
the external display while sitting at the desktop, the desktop is being
expanded to cover both screens. However, the background image is garbled
(mostly black, a few distorted traces of the original background image
are still visible). Additionally, there appears to be a problem with
screen refresh. When I hover over the sidebar (e.g. Firefox) the label
will appear, but not disappear when I move the mouse away.

Next, I used "Monitors" to disable the internal display and enable the
external display only. It took quite some time to switch to that state
(10-20 seconds), but after that the display was fine.

I then switched back to the dual-head configuration and sure enough, the
problems came back. It even went so far that when I unplugged the
external display, two windows that were previously open became part of
the background image.

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https://bugs.launchpad.net/bugs/496890

Title:
  [i945gm] Garbled screen when disabling internal display on macbook