Just to add some extra information:

This happens to my system regardless of KMS, If I use kernel append:
nomodeset the same thing happens (unstable VGA output on laptops
external port).

With regards to obtaining an image (a wobbly one) at all on external
VGA: it seems only possible at 75Hz, if I attempt to change this to 60Hz
in Preferences -> Monitors this is where the whole system hangs.

-- 
radeon KMS causes corrupt VGA output on X1400
https://bugs.launchpad.net/bugs/562138
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