Bug solved after upgrading to 8.10 RC! Resolution is now right, noise
only appear after configuring the external display, re-initializing X
makes it disappear.

Wrong colors were to the monitor's configuration, which switched to
YPbPr instead of RGB for an unknown reason.

Now everything is all right!

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Macbook Air + external monitor = Wrong resolution, wrong colors and noise (+ )
https://bugs.launchpad.net/bugs/279149
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